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Old 11-17-2010, 05:46 PM
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A few things to check,
Have you looked at the exhaust to be sure there are no restrictions. This
can kill power.

Check the fuel pressure with a gauge

You say the vacuum advance brought it from 17* to 50* at idle, this is not

I would expect to see more vacuum at idle with that setup, a leak or a
plugged exhaust or late timing will cause low vacuum readings.

Check the voltage at the HEI, it should be battery voltage. That car
originally had a resistor wire feeding the coil and the running voltage would
only be 9-10 volts. This will reak havoc on an HEI.
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