Okay , here's our progress so far. First the 10 bolt. It started out looking like this:
Then after a LOT of scraping sanding and cleaning:

I then used POR-15 ,the Marine Clean and Metal Ready (all POR -15 products) to get this:
I'll still have to topcoat it as POR-15 does not react well to sunlight. But it won't get rusty again.
This pic is a peek at the 3:73 gears , plus a few other goodies. I used a Ratech rebuild kit , Ratech solid pinion spacer , and a stud kit for the bearing caps I got from Thunder Racing. I also had the axle tubes welded to the the differential housing and removed the casting flash for added strength.

I realize that a 10 bolt is not going to be even remotely strong as a 12 bolt or 9 inch but it should do ok for my purposes.