I think as a base starting point this is pretty decent. Your car probably idles around 45kPa and you may find that you want a bit more timing in that zone. I run about 24 degrees there and have a full 10 degrees less duration on my cam.
I also think you can stack some timing at 100+kPA in the higher rpms. Again I push in another 2 degrees between 4000 and 6000 myself. I would also experiment with a bit more than 10 degrees additional advance in your cruise zone.
You may want to watch your half to 3/4 throttle timing around your engine peak torque. at around 60-70kPa you might be a little hot there.
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-Jason
1969 Pontiac Firebird
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