I don't think Holley supports OEM versions of carburetors. Try here:
http://www.tomco-inc.com/CarbCatalog.htm (click "Automotive & Truck Kit Applications")
May God's grace bless you in the Lord Jesus Christ.
'78 BRONCO: 508" stroker, TFS heads, Dominator MPFI & DIS, cold air induction, dual 3" exhaust/Magnaflow mufflers, 100HP progressive dry direct-port NOS, A/C, Lentech Strip Terminator wide-ratio AOD, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, custom traction bars, 4" lift, 35" mud tires