the factory ecu actually handles it quite well...runs out of fuel at about 11 psi though...I got bored and did an experiment...also made a flat 180 lb-ft tq curve from 3200-7200 rpm and peaked at 218 hp, this was on a mustang (stock 05 sti is roughly 210hp).
The A/F's sit around 11.2-11.5:1 (dual LM-1's monitoring) and EGT's never went above 820*C...no knock counts either. Still had a few fat spots and timing was conservative from the data logs. The ECU does save itself using timing.

Injectors, FMIC,Tial 38mm EWG and a tune would suit the set up well for a nice small budget set up.
Beyond that I will turn to built engines and rotated turbos