Look at the 02ish 3.8L mustangs. I assume your looking for 2wd?
When I was doing research on replacing the trans in the 70 Torino I had, I did a fair bit of searching in muscle and ford performance sights and this was a very popular swap. The mustang trans were good and plentiful and could be had cheap. And the 3.8L is the sbf bell housing. Still need the controller as it is a 4r70w.
My 98 explorer w/v8 has the 4r and its been rebuilt at some point in its life and shifts awesome in all gears. I love how it responds and acts. However my wife's 98 with the same setup is old and tired and shifts lazy. Hers is next.
Search car-part.com for a trans.