Need help again guys yenko tribute [ clone] car

[WANNA BE SYC]

First put new quaters on 69 camaro and want to use torque thrust d 15" wheels.Whats the largest wheel / tire combo I can use? Second: Want to use factory 4 core radiator with mech. fan and clutch.Can I use long w/pump? Third: Want to use Holley 830 anular discharge carb. but I seam to have a problem with fuel pressure about 3 to 5 pounds but not constant.I think I'm sucking air somewhere in supply line.Friend say 830 to big. front 2 barrels seam fine but when you go W.O.T. it falls on its face. Thank you in advance. Mark Bower BTW eng is std 454 w/396 closed chambered heads lunnati solid cam. Msd 7al3 Igniton