Maybe a better way to express it is that longer overlap cycles and longer exhaust duration drain effective cylinder pressure, all other things equal. This gets back to the dynamic CR issue.
What is clear from the thread is that if you choose fuel quality as the constant in the equation, you will have to vary camshaft timing with the CR ( as well as exhaust scavenge and port filling efficiency ) to arrive at a final answer for the combination
I could easily see 10:1+ static CR a long-cammed (041/744-like) car with a slightly rich mix, good scavenge and good ignition running just fine on 91 Octane Cali gas in a light car with good street gears, and be a stone pig in a heavier car with no convertor, gears or tuning.
What is also clear, at least as a free opinion, is that if your engine builder cannot give you a reliable recommendation for your desired combination and results that you need a real specialist Pontiac engine builder.
The cost is not that much more for the priceless knowlege that what they are doing not only works, but kicks ass.
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