454/468 Engine Buildup Help Needed! =)

I'm thinkin about buying an 86 IROC Z to make a street driven torque monster, I can run up to 12-1 C/R Or so, and I really wanna use stock 454 heads and just port,polish and install new valves, which heads flow better? what would be a good cam choice, 2500+ RPM range is fine, I want a real rough idle, prolly gonna run possibly a M-22, T-56 or a T-10, dont know yet, 12 bolt rear eaton posi 4.11+ Gears (possible Tub Later on), major frame mods of course, anyone know a combo that fits this? Thanks Alot!

~Chris