Yes we usually open up the plenum on the bigger motors especially. The Stage V piece is pretty nice if you ask me. FWIW and I know that is not much I would run it 1 to 1 with some 650 AVS thunder series carbs. Greg don't confuse a rich 650 with it not being the right size.The factory Carters were 625s. Tuning lower compression stroker hemis is not easy and generally needs some instrumentation to aid in it.