How bad is the rear main leak? It is not fun to fix in the truck. I've used a sneaky pete before, will never do that again. All that work and it still leaked... Personally, I'd save it for a total rebuild unless it's just pouring out. Or, pull the engine
Sorry, this is a bit of a pickle - it's hard to do things the right way like you'd really like to when pressed for time and budget is an issue. Have been in the same position before, and it sucks.