Alright i Have a 350 with vortecs and with the 64cc heads i should have 9:6 comp, but what size of head gasket is that with? Would it be worth a head gasket that might give me alittle more comp?????? Basically which thickness do i need???

When figuring your comp ratio, keep in mind that the Vortecs are actually closer to 62cc than the 64cc advertised.

I think I used the fel-pro blue gaskets on my Vortecs. I don't remember what the compressed thickness was. Sorry