Thank you Keith and Rodger! I'm thinking it might make sense to simply buy a used 97 OBD2 ECU and wiring harness on ebay and replace my existing 95 OBD1 ECU? Any reason why that wouldn't work on this LT1 motor? Compatibility issues? Sure would be nice to be able to connect a scan tool to get data and codes.

Nothing wrong with the headers other than one is rusty. They clear the plugs/wires with plenty of room. The air cleaner is on now and no different. I unplugged the MAF while the motor was running and it wanted to stall which makes me think the MAF is working properly.

I'm pretty sure Keith is right. There's a bad ground or corroded wire somewhere that happened while it was in storage. I'm running through all the wiring now using the ECU diagram. Hopefully I'll find it. Really appreciate everyone's input. I'm a software engineer who grew up in a mechanic household so I'm by no means an expert but I catch on pretty quick with this stuff and it's fun!