4 barrel help 225 slant 6 offenhauser intake

Your going to need to fabricate your kickdown levers. Go over to slant six . org and search the articals. There are some examples.
On the carb the 390 is a good choice but with your 3.55 and headers sounds like a 500 carter or a little larger holley would work also. The 273 afb is what Chrysler was suggesting as a base carb for high performance. San Diego weather doesn't hurt either! I would get your dissy curved on a machine too.