I had a similar issue, and it ended up being a bad coil. The engine would stop revving at 3500-4000 rpm. Thanks to this forum, I was able to diagnose it properly.
Good luck with this. Lots of good ideas here from knowledgable people.
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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
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