If the fuel pump/injectors are the same as on a r33gtr then without them you still should be able to run 20psi with a safe tune.
if the r32gtr afms are the same as r33afms then you will not need to upgrade these either, although its not unlikely that they might need replacing at some stage anyway, and you might as well put better ones in..
also why use spitfire coils? are your current ones not working properly?
even if you upgraded the injectors, 700cc is not necessary, 550 would be fine if you are sticking to n1s or similar (2530)
if you run 20psi with r33 n1s your car should have 300-320rwkw (400-430rwhp)
should be enough to run mid 11s.