I have a 1986 19' Invader with a Volvo aq125b engine and 270 outdrive. I have pulled the motor to rebuild it and after pulling the head I found that the number 3 and 4 exhaust ports are corroded. My question is can I use a cylinder head off of a volvo 2.3l b21 car engine and if I can what would I have to change for marine use.