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"The engine doesn’t idle as smooth as it used to and the gauge bounces around by about 2 inHg" If the only thing you did is fix all the air leaks then I'm tempted to say that it needs more air????????? When it was leaking the engine ran more smoothly? Of course this was at a higher RPM which...

Maybe he got Corona???/ Vacation??? Family Emergency???

I agree!!! I actually hooked up a vacuum gauge to the engine so I could see the vacuum drop while I was driving around. I made numerous runs at different speeds while cruising, then mash on the gas. When I finally got the right power valve the engine responded so nice. I had been fighting...

I can understand why you don't think it's the power valve. I'm sure the timing is correct since the owner seems to be turning over every stone?? But no matter what carb you install....if the big motor gets starved for gas (Lean condition) when you mash on the gas you're going to get a stumble...

That sounds exactly like a power valve problem. I had the same problem and fixed it with the power valve. The same thing (stumble) should happen and any constant speed if you mash on the gas. The power valve "senses" a drop in vacuum when you mash on the gas, when it senses the drop in vacuum...

The Holly power valve will fix the stumble. But you didn't explain the "stumble" very well. The power valve gives the car a boost of gas when your driving along at a constant speed then mash on the gas. Did you try changing the power valve???

Depends on whether you're going sideways or not!!!:lol:

"What do I need to do to get up to 145mph." Really good tires????:steering: