1965 3 speed manual questions

[l79m20]

Hello all
My 65 has been whining real bad and popping out of gear very often while driving. So I have been on the lookout for a rebuilt trans for it. I found one within reasonable distance for a couple hundred bucks that came out of a restored 1965 pickup with less than 1000 miles on it since rebuild. I went and got it and have been looking it over and it turns out that it is a Saginaw 3 speed with a longer tailshaft than the Muncie that is in mine. It looks like the linkage might be difficult to make work. Also I've been reading posts on here and seeing things about a 3 speed Saginaw with overdrive. Pictures of what I bought have been attached. Any help would be appreciated. Thanks!!