That's what I was trying to get at, vacuum at highway speed. You figure 65-70 mph, M-21, 3.42 gears, that's got to be in the 3000+ RPM range, but the kicker is, throttle position.
You're probably at 1/2 throttle, with the blades open that far, I bet you have less than 8, if not less than 6" of vacuum. So no vacuum advance. That's why it runs hot at highway speeds.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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