Hey man I ain't nobody. Just a reg guy like everybody else. You're right though, but I think the basics plus maybe some carbon buildup, oil stem seals hard, little lean on the mixture maybe. All added up will make it ping easier. I agree most centrifugal starts too soon and it has got to start at least a couple hundred rpm higher than highest idle speed to work good.
A 389 center cam will allow 20 crank degrees advance with numbers down. So figure the initial setting plus the cent and you'll have the total down... just got to see what rpm it starts and where its done. Easily verified. Now... and I'm sure the carb guys will agree... don't go changin the guts in the carb till you got the basics in order. Give it a fair chance then change it up if necessary.
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