Vacuum on 1968 GTS 340 4 spd.

Ok, so I didn't have much luck scoring and measuring as you suggested but I did install .030 rocker shims on one side and started it up and every lifter was ticking . I did let it idle enough to be sure lifters were pumped up as well . I removed the shims and motor back to nice and quiet.Maybe a little short if anything. Now comes the strangest thing. I decided to do a compression check and found left bank all averaging near 175. When I check right bank all about 145! WTF ! I could have sworn I did both sides when I check it last July , I must be losing my mind.I didn't deck the engine. I used EDL-7326 that came with the heads they say .050 . Could I have swapped the FEL-8553PT head gaskets .039 that came with my Felpro set? I measured .065 uncompressed on each of the Felpros I still have.:BangHead: