Keith,
I don't see any aftermarket MAF listed in your mods list. You will need a different MAF to support the injector upgrade, so I suggest you be prepared to purchase both at the same time, and start investigating your MAF options. Try using the SCCoA search feature to locate information on them, as that topic has certainly been discussed to death.
If you have an AFPR, I would start off my keeping the pressure at stock readings, and they play with upping the pressure once you get the car running correctly. As for me, I still use 39.5 psi in my 42# injectors. Works like a charm, and easy to tune with.
Good luck!