The T-85/R11 combo is bullet proof, I think they used them behind the 406's in the early 60's. But pricey. The T-86/R10 will do fine if you don't drop the clutch hard.
I did an odd ball Granda top loader, sometimes referred to as a T&C. Don't know why. You turn down the front bearing retainer to fit the Y block bell housing, bolt up two bolts and drill and tap holes for the other two. Been years since I did this. So, if I'm wrong, someone will correct me.
The trans is identified by an odd bulge on the right rear. Ford used a light duty top loader, and replaced 3rd gear with an O/D ratio. The normal 3/4 shift arm points up instead of down, so a standard shifter will work it. Weird deal, took me a while to get my head around it. Your actually shifting 1-2-4-3, with 3 being the o/d.
It has a 3.2? First gear and about a .8 o/d. If you've got 3.5 or higher gears, it works. The Jeep guys did a lot of these, maybe 15 years ago. Worked ok, if you can find one really cheap.
I bit the bullet, and changed to a T-5. But it's an option.