Jon at FIC can set you up with a new set of stainless injectors and gaskets and seals (Gaskets c/o Jerry's Gaskets, BTW). I use the Accel #150821s (from Summit Racing) with no complaints for 4 years running now.
Note: As for coil packs, I installed fresh coils with GM coil (direct replacement) "while I was in there" too. (When in doubt of what the readings should be, I measured resistance on both the primary and secondary windings, looking for consistency. However, one of the coils measured "open" between output terminals, so I replaced the all. All the readings then were the same across the lot, and the car runs great!) That was 6 years and 20k miles ago w/ no issues with them since.