I would not recomend making your own Head gasket. As a mechanic by trade the head gasket is the most important and ususlly made with a metal lip on them to protect them from the compression and fire in a cylender. I haven't seen a 750 head gasket, but I have seen automotive gaskets made of metal or graphite covered matereal. With 10 to 1 or so compression you will probabley blow away the head gasket if you use the roll type.
Chad Falstad "Hawk"
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"