340 Static Compression Numbers and Test Procedure

Ok, I forgot you posted your curve already. I also just went back up and looked at your Pistons. I'm not fond of making statements based on pictures and/or video but the tops of your Pistons look like they are getting hammered, if you can believe the pictures.

I'm guess the cam is way too far advanced or was never degreed in the first place and that's what's running your cranking compression through the roof. Or, they just picked a cam out of a catalog and flat missed. Or, they didn't have a clue as to what they were doing.

At any rate, you'll need to clean up their mess.