The idle circuit is out of play.
You're running a 64 center jet? If yes, try a 63 or 62. On this one, you are confident your power valve is good and the power piston is installed and the spring correct?
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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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