Your block deck (stroke) is a given distance. As a rule, .020 piston top to deck is typical for that era of block. When you 0 deck the block (or mill heads) you take away that .020 and increase compression by removing volume of the combustion area.
Knowing your piston numbers (specs tell me how far your pistons sit in the hole), just a clean up on block (maybe a few thousandths clean up) and knowing 20 thou was taken off gives me a rough number of 10.2 to 1.
That is all. No pics needed at all.
Brent will give you the MIT/Oxford explanation....
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
