I have a lower unit and a raker stainless prop off a 1987 225hp Johnson outboard.The outboard is at a shop and the shop said the motor needs a new powerhead and if I wanted they would just keep the outboard for the work done which is about $300.00. I dont know if I should just pay the $300.00 or part the outboard out myself Im sure the lower units ok the prop is in good condition please help.