Why does every1 build "OEM" N/A motors (pistons/intake mani's)? I don't get it - LOL. Get some GREZ 12.0 - hell even some Probes if you are tryna keep it a budget build. Do NOT skimp on the header b/c w/ the head you are using you are gonna need a serious header to compensate for the "stockish" head you will be running.
Secondly... in PR you are only 1 octane below what the west coast gets outta the pump (Cali) -- and there are some serious pump-gas builds there. 90 octane is hardly low enough to worry about (based on the build list you have stated) IMO. This build so SO mild that I hope the car is going on a diet and getting a lighter rotating assembly (ie. SCAT rods are lighter and stronger than the ITRs) and LSD.