it will not compensate ... the system cannot compensate for such a large difference and you will lean out badly. to maintain a safe AFR at boost you need to be in the 12:1 range minimally. these engines are tuned to run leaner than that at WOT from factory. adding boost will mean it needs to compensate for the extra cfm and run richer than it is programmed to in order for it to be safe ... it is just not happening.

two options ...

one, disable the stock fuel pressure regulator at the tank side and use a adjustable rising rate regulator with a return line plumbed into the lower filler neck..

two, extra injector running off the schrader port of the fuel rails.

either way ... you need to provide more fuel.

5psi will give this car 50hp extra minimally ... that hp comes at the price of heat, the air charge will be heated as it is compressed, even the best intercooler cannot bring it down to ambient.. which menas you need the extra fuel and/or reduced timing to compensate ... i honestly think you can get away with just having extra fuel so long as your air fuel ratio tuning is done to perfection. the higher timing gives you a smaller window of error but does not necessarily mean it cannot be done safely.