T-5 on a 260

I believe that all 260's and some early 289s were 5 bolt blocks, and later 289s were 6 bolt blocks. Mustang Depot sells the adapter plates for both 5 and 6 bolt blocks, so you should be able to put a T5 in there. Unfortunately the spacer for the 5 bolt block is about 50 bucks more than the 6 bolt. i dont think its possible to mate a 5 bolt block to a 6 bolt bell though.

www.mustangdepot.com