i have a .63 housing aswell as greens and the setup is fine, i think he's trying to say that to get the most out of it then larger injectors+more boost will make more power (370+ ) whereas the .48 would not be as effective for this much power.

i run 25 psi which Stu said will be fine for reliability, provided the correct uprated head gasket is fitted.

Also go for the -34 if you intend to run proper stage 3 boost levels, it is more suited and it comes in with a bang

for you i would recommend the .48 with greens, -34 and around 26 psi.