Thanks Mitch.
Engine is a 383, and I forgot to mention that the car was tuned by PCM Performance. I have a second PCM with a tune by Moe Bailey (also for a 383) - swapped it in and the issue persists, so I don't think the problem is tune-related. The Moe B tune was in there before and ran 100% fine. The only things different from then and now is the addition of a 58mm throttle body, and an Edelbrock intake. PCM Performance tuned it for the 58mm/intake.
Fixed the fan - forgot to put in a fuse.
Car smells pig rich at idle though. It'll almost burn your eyes. I'll pull the rail and put cups under each injector and crank it. Maybe something got into the rail while it was sitting on the bench.
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