What efi system is best for a 4.5 pfi cadillac engine7

[S.O.B.B.]

Thanks Stew.I had globally lean.was trying ve table adjustment with each number I increased bpw.I just never had a bpw starting point since I have so much mismatched parts.the 148 stock setting I started with never worked because my timing was out due to spark latency being incorrect. So when I corrected it I never tried just starting over at 148 bpw.I'm at 153 now and running decent accept for a stumble I get if I don't roll on the the throttle.I also tried one burn with bpw at 154 and changed injector bias to .37 from .4.it didn't run well at all on that one.a lot more stumble. Once I get a nice day I plan to try the 5.0 injectors that I just gave an ultrasonic bath to.change bpw and see what I get.