You can't use that pan for your boat if you are running the drive shaft off the flywheel. You need a v-drive pan & oil pump pick up as your engine is in the boat backwards. V-drive pans also have baffels with little trap doors that open backwards from a standard pan.
Look into a Dooley pan. They are not cheep but someone might have a used one.
For your v-drive, it most likely needs new bearings and your driveshaft needs new u-joints. Don't skimp here as if one of them fails your sitting right next to it.
I would send your v-drive off to Tom @ Menkins for new bearings and have him check out the gear setup.