I'll go with Cab. Carb tuning - squirter and pump cam timing/coordination, is a very tedious job that can provide surprising results. No simple, blanket answers. Footbrake is harder to tune, but I never ran a trans brake or 2-step.

One goal is to get the primary and secondaries to finish squirting at the same time, once you figure out when they need to stop. How high you come up on the converter (footbrake) affects how much fuel is left to squirt when you mat it.

Squirters and pump cams for 60' and jet for mph.

I tend to be conservative, so I'd suggest a smaller carb (750-850), better intake (Holley Strip Dominator) and experiment with spacers (tapered 4 hole?).