Here is the numbers I used:
Block Deck Height = 9.600"
Bore = 4.070" (0.030 over)
Stroke = 3.310"
Rod Length = 6.123"
Piston Height = 1.840" (TRW 2316)
Valve relief volume = 7.5cc (seems big, is this right?)
Est. Head Gasket Volume (0.040" thick) = 9cc
Cylinder Head Volume = 75cc

If the engine is the stock 9.60" deck height the piston should only be 0.018" above the deck, and the compression ratio calculates to 9.05:1

If the decks have been milled 0.012 to where the piston is 0.030" above deck, the compression calculates to 9.29:1

If you use a 0.020" head gasket (estimate 4.5cc) or mill the heads 0.020" the compression should be approximatly 9.76:1

I don't think the positive piston height will be a problem, but check the head chamber height to be sure. On my 360 heads the chamber was recessed 0.070"+.

The combination looks good for a dual purpose vehicle, but most likely mid to high 13's?
I don't know the cars weight, and the track altitude. Anyhow, to run 12's you will probbably need more cam and compression?