19 degrees Initial timing is high for any of these engines if they have much compression in them. Total timing a bit high, but I've had a few over the years that were fine in that area.
Timing at light engine load is pretty low, hence the advice to use Vacuum Advance above.
I'd also mention that unless the engine has higher compression running high octane fuel which burns slower has no benefits whatsoever and requires more timing as well..........
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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