If your engine canīt handle the original vacuum advance at idle speeds, go TCS or ported source for it.
Using a "lighter" vacuum advance is asking for light part throttle ping.
This and "all in" mech advance at 2500 rpmīs are the worst advice available.
May have been good in the 60īs, not with today fuels though.
At least that is what i found some twenty years ago when i got my .030" 455 finished.
JMHO
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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