compresion test of 125lb. Cam question

It is pretty hard to say definitively what cranking cylinder pressures you should have from the cam data...and you did not mention compression ratio which of course is important to the compression numbers...or the craking RPM's, which is also critical to compression numbers. So even if this could be closely 'calculated', important data points are missing. At least your compression numbers are very close.

Also, what is the weight of the old car vs new, with driver? This could explain the whole difference in ET's by itself. You have lot of changes going on that can bear on the ET's old vs new.