I have an OMC cobra 87' 4.3. The upper gearcase needs to be rebuilt. I have been put on waiting list at local marina. How much, or what would be, the price range I can expect for them to pull OD, rebuild upper, set gearshift, replace drive onto boat. Are there any ups to just getting an outboard and gill bracket? The 4.3 is in good shape and the boat ran really well prior to running upper case w/o oil.