yes and no.
#1 - 10.65psi is the limit of the factory 2-bar map sensor on obd1/2 cars. it is less on obd0. any more than that, and you are going to need to run the GM 3-bar map sensor.
in order to run your car- like idel and shit- you need a computer that can READ a 3-bar map sensor's voltage- IE, a hondata, or ems.
#2 - you will never make 400 whp off a vafc hack.
#3 - 440 cc injectors top out at about 250-275 whp on stock rail pressure.
#4 - A lot of people don't use it, because its by definition a hack. It tricks your ecu, and it sends it false info based on voltage levels controlled by the afc. using a hondata/ems, you actually take the reading, and USE it to compensate your cars fuel, etc at any given time.
#5 - 550s won't idel well if at all on a vafc hack- but more so, the -30% that the vafc allows isn't going to be enough to "kill down" the larger injector at low rpms. and running rich is slow.
#6 - I think you need to really re think your setup. Start with a goal - a power level. you want 300-400 hp... well, most people don't run more than 350-ish off pump gas. after that, you're talking race gas, and $5.99 a gallon. Can it be done- sure. off a vafc hack? hell fucking no.
#7 - everything that loco said above