If you have to replace the heads on the 480ce (which I hear is about 10k for both sides) can this easily be done in a 42 Sedan Bridge? Do engines need to come out or is there enough room in there to do the job with the engines and boat not completely disassembled? Second question. Say there is an oil pan gasket leak? Is this an easy fix? Does engine have to come out? I can't imagine the parts are much but the labor must be intense?