Originally Posted by mbbuff

My 4A1 works fine, always has, except when the float failed. I think I am the only one that has ever messed with this one. But, then again, I've worked with carburetors off and on for 40+ years. If I were to ever change (which I won't), I would adapt a 390 CFM 4160 Holley (List No. 8007, I believe) to the stock manifold. They offer more flexibility, and reasonably priced parts availability than any other mainstream carb. that I know of. Every system (idle, accelerator pump, main, power, secondary, etc.) can be custom tuned for your application. Linkage would also be easy to adapt using mostly stock components, IMO. Biggest problems would probably be mounting and adjusting the stock MB vacuum governor and making an adapter plate. Hmm, wonder if I should do this as an experiment. Carb. is only about $300-350.