360 magnum short block

Bingo.

In example, my KB 107 slugged 360's are 1 @'zero deck and 1 @ .010 in the hole.
Add one 72cc J head and the zero deck slugged 360 is 9.8-1 and with the 65cc head and thinner gasket ape we (IIRC) 11-1.

Knowing where the slug is in the he helps. I found the piston @ Summit racing with a listed compression height of 1.6xx. If the deck was milled, how much and the piston question again, how far in the hole does it sit?

If you do not have the tools to measure, that's OK.