3 Speed transmission (3 on the tree)

[GreenBay1921]

I have a 1968 swb with a Muncie 3 speed. The truck had been sitting for 25 years before I got it. It shifted fine, but was roar like a beast. When I drained the transmission, it had a good 10-12 oz. of crystal clear water in it. When I cracked it open it has a good bit of pitting on the tip of the main shaft & most of the gears. That being said, I'm pretty sure I need to scrap it. I'm looking to keep the 3 on the tree, so I've been looking for a replacement. My question is: will a Saginaw work, & if so, will I need to replace shift linkage. It looks like the linkage where it connect to the transmission is different from the Muncie to the Saginaw. Do you guys have any suggestions about my situation? Thanks guys.