SNIP I just want to plan accordingly, i dont want to build a turbo system(including fuel) that can say handle 500hp and the engine blow up at 350 or vice versa. SNIP
With divided intake runners and port EFI - with the dividers extending into the intake manifold upstream of the injectors by say 1" you will be well ahead of the a/f distribution issue.
An alternative is to get an integrated head and mill the intake off of it ( of course this will need a custom intake) as it has a 12 port intake.
If you go EFI, I would suggest going big enough on the fuel supply system to handle any future upgrades. The delta cost between a 300hp and 500HP pump is minimal. For 300HP the injectors are J/Y items these days. <<< 28#/hr injectors.
