Contemplating yanking out the 305 TBI from my '91 RS and replacing it with a GM Performance zz383. I want to still use the factory F.I. and ignition systems. What (if any) computer updates will I need to do? Are the injectors big enough?

 

You will need to set up the timing and fuel curves to match what the new motor wants. PROM programming, or an aftermarket system such as EBL.

Seriously? stock 454 ones might get it.