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Full throttle you had 3.5 inches of vacuum? That generally indicates to small of a carb. But perhaps the vacuum secondary is playing into this. Was that reading at full throttle max rpm or what? Do go to a larger squirter (stick with the plain secondary spring while you are doing this). I would go up a bunch on the squirter size, say to a 40 for a start. Also get the cam and try the largest volume cam in the set. Be sure to adjust the squirter after this is done. Don't worry about the .015" additional travel at WOT crud. Tighten down the spring until there is a gap and then back it off until you contact the arm. If your vacuum readings are 3.5 WOT and 5 at idle, you have an issue with the power valve. I am not sure how to skin that one.
Did the car accelorate strongly once it did catch? Change one thing at a time. It may be slow but it will pay off in the long run. It does sound as though the jet size down was the wrong direction.
Tell me this, at idle do you have vaccuum at the ported vacuum port. That is the vaccuum port near the top of the main metering body.
Rick
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