Compression Issue (thin head gaskets??)

hey guys were building this 318 for the bosses wifes truck...

and will with the head cc's and piston in the hole were looking at a measly 8.5:1 comp... this is with a 4.04/.040 head gasket...

this 318 is only .040 over so 3.95 bore...

any body know of a .020 thick head gasket with a close size to that bore? nearest i found were cometic in 4.04/.040 thick giving me a 7.8:1... would like closer to 9:1

heads are 70cc
slug is .070 down
4cc for valve reliefs
3.950 bore

may just have to mill the heads...