Guess my 273 hp

Well I had my 308 heads tanked and they are cracked between every valve. I talked to my machinist and he say they can braze the small crack on my 920 heads. So it looks like my 920 heads are gonna get some more love. 1.6 exhaust valves, spring pockets cut for dual valve springs and milled to bring compression up then put back on with .028 head gasket with 3.7 bore instead of the .40x 4.03 that's in there.