Mild Built 340 Timing/tuning help?

Or me, Lolol! Plugging the numbers into the dynamic compression ratio calculator shows between 8.7 to 9:1 compression at 2000 feet of altitude (depending on what part of LV you’re in). That’s if the cam is installed where it’s supposed to be (106 ICL) with the intake closing at 60 degrees ABDC. I think your cranking compression is acceptable, but it wouldn’t surprise me if you had advanced the cam a little. Any idea how far below deck the pistons are? No doubt that could be tuned to run on 87 junk gas or 89 mid grade without issues.