Howdy. I have stock original condition Ford Mustang 1971 Mach1 3-speed manual with stock Autolite 2100 carburetor. I've been looking new carb for it and mostly Holley 500 CFM line.
But I found this adapter and started to wonder does this rely work. I've found only one video where someone put's this to junkyard car and started engine with it, but no driving.

Then I could upgrade step-by-step my engine first to 4-barrel and after sometime I upgrade to better manifold which takes 4-barrel straight in.

Because there's no different holes for all carburetor flaps will fuel be mixed right in first and second stage?