I mentioned a while ago, you really need to be sure your ignition is dialed in before assuming the carb is the issue. I assume it is.
As for trimming that power piston spring, that is related to the vacuum / cam. I would just follow Pontiac Tri-Power or Dick's advice on that one.
Also, I went for a cruise last night, and there is a lot of fluctuation on the 02 meter both at idle and different cruise RPMs. That is normal. My warm idle fluctuates 1 whole point sometimes.
Maybe the 62s are the right size for you?
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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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