I have an 85 hp force motor with T&T. I am looking to part it out because i am unsure what wrong with it. My mechanic pulled the head and could not find any issues. however he did not look at the reeds. the headgasket needs replaced before we can do a leakdown test. I know the lower unit is in working order and the majority of the other parts have been replaced. fuel lines, carbs etc... How much can I ask for the lower unit assuming it is in working order? and assuming that 95% of the motor is functioning? how much could I ask to see the motor as is if most is functioning?