Agreed, you don't need goop on a HG. The normally have an orange/red line around the outside of them anyway. This is basically a heat reactive line of goop anyway, when the motor heats up the lines seals up.
Saying that though, I have given head gaskets in my boosted motors a spray of VHT "Copper gasket" before, but that's all I'd do. Careful too.... its nasty stuff that'll make your nuts shrivvle. :wink: