Compression ratio help

Bore X Bore X .7854 X stroke= Cylinder Volume V1

Bore X Bore X .7854 X Deck Height= Deck Clearance Volume V2

Bore X Bore X .7854 X Head Gasket Thickness= Gasket Opening Volume V3

Comustion Chamber Volume in CC's(cubic centimeters) To Convert CC's to Cubic inches, Multiply CC's by .06102 CC's X .06102= V4

(V1+V2+V3+V4)/(V2+V3+V4) = COMPRESSION RATIO




This is some info I found on another forum about compression ratios.

My build is on a 1973 351C with 2V 76.2cc .40 over bore, stock stroke.

I am using these pistons do I subtract 2 cc's from the cylinder head cc for the equation? Also should these pistons work and not hit the valves? Will I be able to run pump gas?

Any estiments on the compression I should be seeing?
The block and heads are stock deck heights

Keith Black/KB Pistons KB177-040 - Keith Black Hypereutectic Pistons - Overview - SummitRacing.com

UPDATE

I plugged the info into a compression calculator and came up with roughly 9.8:1

The pistons barely have a dish, its just one valve relief if you take the time to look at the link.

And I was thinking a 268 comp cam or edelbrock performer. (going for mild performance.