low vacuum 383

I have a thread open about vapor lock but this is different.
My 67 Sport Fury convertible with a 383 2 bbl only has 8 inches of vacuum . Timing is set at 8 degrees vacuum is steady at 7-8 inches depending on the vacuum gauge. compression is 160- 165 across all cylinders. idle is set at 700 RPM . the idle is smooth but sounds like it may have a small cam in i,t as there is a slight lope heard in the exhaust. I have used propane but could not find a leak, plugged the brake diaphragm hose and...

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Author: 67 ragtop