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Thread: Best EFI option for '66 Mustang 289 Auto?

  1. #1

    Default Best EFI option for '66 Mustang 289 Auto?

    Novice here and I'm looking for some advice and guidance before dropping $2K. I want to swap the Holley 80457-3 carburetor for EFI on my 1966 Mustang, 289, Auto, stock.

    I've searched the forums and I've read the Holley website and product instructions. Below is what I've come up with needing. Can anyone tell me if this is all I need? Or If I've selected the wrong EFI or if there's a better option I'm not seeing?

    I'm mostly confused about the fuel pump. The way I'm understanding it, my mechanical fuel pump won't produce enough pressure, but if I get the Returnless Kit listed below it'll include the appropriate pump that I install into the existing tank and I'll be fine? Just leave the old fuel pump installed or it comes out?

    Holley Sniper Returnless Master Kit - Black Ceramic, Part No. 550-511D, $1663.95

    Weiand Sealing Plate, Part. No. 9006, $24.26

    Sniper EFI Installation Kit, Part No. 520-1, $31.93
    Last edited by 1966Mustang289; 09-21-2020 at 06:37 PM.

  2. #2
    Join Date
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    I suggest you purchase the Holley EFI parts from a Holley EFI dealer. Contact Chris Myer at EFISystemPro.com or Fuel-Pumps.net. He's a Holley EFI parts professional, Holley EFI Dealer & fuel pump/fuel system specialist.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  3. #3

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    Thank you. I reached out and they were incredibly responsive and helpful.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,073

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    You're welcome.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  5. #5

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    @1966Mustang289: I like the idea of the Sniper, but I wouldn't use that particular Master Kit. Since you have a Mustang buy a drop-in fuel pump module that works with your stock tank. Use Holley 12-305 if your stock tank is in good shape or you can upgrade to a new tank at the same time. You can also go with the larger tank if you have a small tank now. I think there are two or three different tank sizes available for the Mustang. The standard tank was 16 and then there was a 20 or 22 gallon tank. I think Holley sells all three tanks and I believe they all will fit in your car.

    If it was me I'd go with a new 22 gallon tank and the internal pump assembly with an internal regulator. That would give you more range and you won't need to run a return line. Just use your existing hard line in the car and hook it up at the tank in the back and to the Sniper in the front. Add a HyperSpark distributor and ignition system and you'll be set.
    Last edited by AndyF; 10-06-2020 at 10:01 PM.

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