The 260 is a 5 bolt and I have the bell housing. The 2 bottom bolts line up on the T5. I actually have an SROD from a 77 Mustang I am using to mock up my motor mounts. I had to remove the front bearing retainer and whack off the input shaft a bit. There is also an adapter that is relatively simple to make, or buy.

I have $900 into that big toploader but haven't had any luck retrieving my investment, probably just leave it under the bench for anything less. I might be interested in a trade but I don't know what shipping that big chunk of pig iron would be like.