I'm doing the same thing with a Bronco Dana 20. (Well, I've been thinking about it for at least 3 years, never got beyond the parts gathering stage.) I was just figuring that while I was making that for the '97 XJ I could make another one with a 241 for the MJ when I plunk the 6.2/NV4500 combo in. If you can use what he's got Brian, go for it, you are more likely to git-r-dun than I am.
PS Opie, I ain't skeered of no surface rust.