First off Your going to be Pressed/hard luck doing a roller cam To run roller lifters.
as for a stainless steel head gasket??? why and again won't be easy to get. IT may?? have to be custom made. The Felpro 1025 should work just fine. bring the compression to 9-1 should help get the HP your after with a straight patteren cam NOT a dual patteren. HYD cam with around a 500 lift and a rpm band from Idle to 5000-5500
should also Keep you in a VERY good power band at 3000-3500.
The head alone will run you in the 1500-2000 dollor range.Or plus depending on the shop.
The stock crank should be fine same as the rods.
your not pushing Monster HP and your not pushing the HIGH rpm power band/range.
Ps as far as a Marine cam Check with Tom Langdon.
God doesn't like ugly.
