Had a '93 Z28. The Optispark system has a lot inherent flaws and is expensive to replace. MSD makes a replacement but I'm not sure I'd trust that either. I swore if I ever bought another I'd convert it to a multi-coil system. Of course, I also swore I'd never buy another. At least you won't have as big an issue as I did trying to change plugs and wires.

I think at this point if you want a Pontiac FI, you'll need to use a universal system and have the intake modified and fuel rails made to fit.