Re: Vacuum low on a 327
Could be the restrictive mufflers. Uncork the headers and see if vacuum goes up. If restrictive exhaust, watch vacuum gauge and rev engine up, then vacuum gauge will slowly climb to zero, or close to it.
As said, advance the timing and check vacuum.
Compression check shows? Anything over 120 PSI would mean the camshaft is in time with the crankshaft - retarded cam, lower vacuum. If stock camshaft, set #1 intake rocker for 0.050" lash, and rotate crank and I think valve starts to open, when lash is gone, at something like 7° BTDC? Its still measureable using the timing tab and h/bal mark.
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