10-12 degrees is a good starting point. It would probably like just a bit more, but only if the CR/cam combination and centrifugal advance curve are optimized for today's gas. Lots of discussion on this over the years in the street section.
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1969 Lemans vert, matador red, 462 CI, 3.07 12-bolt posi
1974 455 TA, admiralty blue/red interior HPP "cover car" - sold
"The best way to show a car is to drive it"
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