Lean out and miss fire

Check your bulkhead connections. A buddy with a 67 GTX chased same symptoms until he found a burnt connection at the bulkhead connector. It was one of the big wires that go in and out from/to the amp gauge. I think those are in the middle of the block on an Early A, and fit under a screw. Good luck with it. That's one of those things that will make you :BangHead: