How far in the hole 318 pistons

yeah Its a big *** isky .505 505 .292/292. 108lsa. 10.85:1 comprerssion (theoretically) and speedmaster 170cc heads.
stock crank, 318, old used circle track 340 rods, $50 dollar torker 340, I already had the cam kit and heads, hell I even had some old mahle main bearings and ARP rod bolts I found at pomona.

The only thing I will need to buy are lifters, headers, and some paint.

Is the cam too big for the street? probably. Is it cheaper than a new one? yes.
And it'll beat the **** out of my friends chevys.
It'll run good too. Don't let the fruitcakes convince you otherwise. Get the compression verified though, not theorized. That's important, but you already knew that.