on the dyno, i used what info i had.. it should be close if parts are right.
you did not show what type of intake it had, that can make a big difference in high rpm horsepower.
you also did not say the size of the carb.
in the compression math i had @ 73 cc chamber to get you to the compression you stated.
i put in a 800 cfm and a different intake, adjusted the heads
you will like this better, as you can see everything makes a diiference