We don't have to keep going in circles here. I have laid out your solution. What are you going to do at this point? Buy TunerC.A.T.S., learn how to tune and use an old tuning software and usb chip burner just so you can compare .bin files with a known stock tune? FAST easy efi 2.0 is self tuning. It asks a few questions on setup and then it just becomes painfully accurate and stable the longer it runs. And .080 over is I'm pretty sure cheese grater territory, isn't it? I mean how long is that gonna last anyways?I'm not 100% sure I purchase the car already built from a friend whose father passed away. How would I find that out by looking at the chip on the ECM?
So now you need to step back and assess the value of the car which is a C4 and add that to the known fact that your engine is on it's LAST rebuild, and then divide that by the cost of the FAST fuel injection conversion and understand better the situation you are in. Is it worth it to upgrade your fuel injection system on your car? Well I don't know? Is it worth it to YOU?