Good way to as I have done the same except with a HKS GT2535.
There is a thread with lots of info on how to install GTR injectors on the RB20det(will find thread after work)
It would be best to get a decent clutch
I drove around with the PFC,GTR injectors,Z32 AFM and the GT2535 for a week before it was tuned.I did'nt really get it on boost and took it easy.One thing you need to do is get into the INJ menu and put the injector % down.I will post more after I get home from work