Compression readings

Thanks for the replies
I took off both rocker arms,,,,removed the carb, blanked off intake.....Put a small amount of air pressure into intake about 5 psi....Wont hold any pressure not even a few seconds..... There is a bad leak, I can hear the air escaping and it sounds like its coming from under the intake manifold.
Originally I had a bad vacuum leak, I had removed the intake and was unable to use any other gasket except the valley pan, the bolts would not line up
So I used RTV over the entire sealing surfaces and that made a difference but it still didn't run right and the vacuum gauge indicated a possible leak
Which took me to were I. am now
Im thinking the one head with higher compression has been been resurfaced to much, raising compression but giving me a misalignment issue with the intake manifold
Regardless I do know valves should be good and something is leaking.......I will be doing a smoke test later this week and to be on the safe side im going to do a leak down on the head with lower compression