Well if I sold my 390 and went bought a holley 500 2bbl, would having to use an adapter plate restrict anything? Also do 2 barrel have half of a four barrel (a primary and a secondary) or is it like a dual single barrel (two primaries)?


69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.