carb size for 512 stroker?

IQ - yeah - I figured there was more to it...lol. Just busting you on it. I agree on the lifter bores - I tend to avoid any hydraulics unless I'm told to now.

James - The engine is a package. As good as it's lowest part. As Mad noted - the heads are not being fully utilized even in their stock form with what you have. However, you need to define what "maxing out" means for you. The 496 I just did used stage II+ Stealths that flowed in the 310 range. With a custom solid flat tappet it will pull past 6300. Hasn't been dyno'd yet but it replaced a 480hp 383 that went 11.80s. The owner swears it will match that and walk by his 550hp Shelby Mustang. This is an Ebody Challenger, with a 3K stall, and 3.23s on repro bias plies. It runs a Holley 850 4150 series on an RPM, through the HP manifolds. BTW - all 383 intakes are air gaps ;).