I've never re-used a head gasket before. The Mr. G's were new and they simply didn't seal properly.

I may consider some new Cometics, or save my money and use one of my remaining sets of the discontinued orange DG gaskets I mentioned previously. The only real issue I had w/ those is they're a big PITA to clean off the heads & block when disassembled... but they sure as He11 didn't leak.