1972 Demon 340 engine mods

OK so I took the heads off and found strange flat top pistons with 4 big valve reliefs at zero deck.
Pistons are not completely flat and reliefs + area around bore gives me bit over 10cc. This added to 8.8cc for felpro 1008 head gasket +63 cc heads gives total 81.8cc so 9.5:1 compression.
Piston will be head gasket away from the head so 0.039" and I guess I don't have much room here.
Another discovery is Mopar purple camshaft .484" lift and 241 duration @.050 which added to no low end power nicely I guess... We will be using 1.6:1 rockers so lift will be just over .516". J heads from the car have small intake valves.

Cam swap coming soon.