Thicker head gaskets/ less compression...

Frankenduster said

Thanks, but I actually do drive the car long distances. I make an annual 1000 mile round trip to Los Angeles and back every year.
I have already decided against the gasket swap. I have been grasping at straws in an effort to fix this problem. Sometimes I feel like the sick patient that is willing to see a witch doctor to find a cure, trying all sorts of unconventional remedies!
Thanks to everyone who offered help, Greg

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Greg - the ideas about looking a the carb and timing curves are all good. I've been able to "fix" higher compression engines by simple tuning. Like you mention - check the power valves especially because if they are late, and pinging starts - it won't stop until you let off. Also look into slowing the advance down. Some engines won't feel "slow" or lose power if you bring them up to max advance at 2800 - or 3K, or 3200. Keep a close eye on the spark plugs for signs of detonation too. You're close, not way over the accepted limits so it might be just that. you might also look into something like Water Wetter to lower the engine temps (internally).