I am running a 468 bbc with 560 lift, log exhaust and 781 heads, air gap intake, 12jc "A" impeller. I have a 3310 750 vac carb ready to go, would that be the best combo or move up to mech second 750 double pump, or 850? I remember someone saying on here there are minimal gains between the 3, I am building a nice cruiser with some balls..steel crank, upgraded rods and valve train. Also what opinions does everyone have on marine carbs, starters, dizzy, fuel pumps versus auto, I am running an open engine. Thx for reading!