I know I should perform an entire uccr on this but I’m unable to right now so I need some help. I have a 67mm cylinder, long rod, HF1 head, port heights are standard. Piston is .060 below the deck at the edge from the top of the cylinder, head holds 18cc of liquid with the spark plug hole filled prior to the 18cc measurement. Goal is running on 91ethanol free gas. Can I get away with using the single piece or should I use the entire 3 piece oem head gasket.? Squish would be .070 with the thin gasket...Worried about the compression and detonation. Thanks guys!