Newbie to cummins. Transplanting 96 12v into 86 F-350. A suggestion was to replace the front and rear main seals. While the engine is out, what kind of job is it to replace these seals. Also thinking of the oil pan gasket. Defininitly will be doing the KDP. What about the water pump? Any other gaskets or items. Heard the installation will be a tight fit. Thanks for the help.