carb size for 512 stroker?

trying to max out my big block stroker. right now there is a 750 carb on it. Should I go bigger? I dont have the carb specs in front of me but I will find them. Cam is fairly large. Stealth aluminum heads. Is it worth getting different heads? working the ones I currently have? 2" headers. 3,200 stall, 3.55 gears but soon to be 4.10s. Dont drive it much but want to make it as wild as possible with few mods. How big of exhaust should be run? What timing are you guys running with a motor like this? Thanks

James