the advice Id give is this from what Ive read and I know other people have done get 2 head gaskets some engines need 1 some need 2 put 1 on and spin your motor over to make sure your piston dont hit the head if you feels it hitting then pull the head back off and put the 2nd one on. you can ask glennbo about it he had to use 2 gaskets because his piston had a kind of big dome. you also might have to change jet size with that head you will almost double your comp.