I’m kicking the idea around to put a LT77 transmission in my Mk2 build. I have an adapter plate to install a Jag bellhousing. I had a lead on a few transmissions. I think as long as I’m not thrashing it will be fine as they were used behind the Rover V8 as well as some late XJ6s. I have been looking for a reasonable priced (under 2k) or so option and I think it’s possible. I know there’s other transmissions out there, but $5-9k is nuts!
Option B is to build one of my moss overdrive boxes (least desirable) . If I could come up with an xj6 box that would be super, but unlikely.