I've thought about doing such a conversion on a '78 F250 Crew or Super Cab with a 12V Cummins for quite some time. If you hire it out and are supplying the rebuilt engine and a conversion kit, you should be able to easily get the swap done for under your budget.
Good luck.
EDIT: Here's some interesting build threads and a couple of articles:
l told my pap and mam I was going to be a mountain man; acted like they was gut-shot. Make your life go here. Here's where the peoples is. Mother Gue, I says, the Rocky Mountains is the marrow of the world, and by God, I was right. - Del Gue
