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Low manifold vacuum
With 4" to 12" of vacuum and a 6.5 power valve the power valve will be opening when the vacuum goes below 6.5" of vacuum thereby making the idle screws ineffectual.
Go lower on the power valve with a large overlap cam.
Been there done that.
Cheers,
Bryan
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COB-66 Young at heart old fart.
Don't drive faster than your guardian angel can fly.
If it doesn't matter what gear your in you have enough torque.
VK3KDN
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