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According to the specs posted on Mac's Auto Parts page:
Compression Pressure: A6050A head, 76 PSI
A6050B head, 110 PSI
B6050 head, 90 PSI
We never worried too much about the compression to new specs. Of course I do not have much experience with these engines, I am thinking from working on an inline 6 w/overhead valves. The key is cylinder to cylinder being within 10 or 15 % of each other, and it seems you are right on the mark there.