Deep Pulley Question for you '67 L78 Owners

[DougA]

I run 100ll in my 70 Chevelle LS-5 454. Original 290 casting iron heads, oval port, closed chamber, 101 cc heads. Around 11:1 CR.
Stock engine except for camshaft change, .544, 230 dur. @.050, hft. Probably don't need that much octane, but engine would ping horribly with crappy Md. 93 pump gas, even pulling the timing back to 32 degrees, it would knock. With 100ll, I keep the timing at 38, no knock, engine runs the absolute best it ever has in 20+ years. It loves that gas. Inside of the tailpipes are absolutely clean as a pin, not the slightest trace of any carbon. Engine starts instantly with the touch of the key, you don't ever hear the starter make a revolution. Happy BB.

$4.75 @ gallon last fall here in Md.