Before I was bitten by the "buy-American" bug (seemingly in a different lifetime) had a MGA with a blown 4 cylinder engine (typical), and an extra Jaguar 6 cylinder engine.
With more time on my hands than I have now had for years, I, with a friend, installed the Jaguar 6 and electric OD transmission in the MGA.
When installed, the shift knob was approximately 18 inches BEHIND the seat

Linkage to make shifting possible was a nightmare. Once we were able to shift the transmission, found the front suspension did NOT like the weight of the Jaguar engine. And driveability was horrible.
Ended up undoing everything, found a rebuildable MGA engine to rebuild and install; and kept the Jaguar engine as a spare.
The whole project was an absolute exercise in futility!!!!! But one is only young once! Not sorry, because I learned a lot; but would NEVER consider doing it again. One often learns by making mistakes!
If you decide to do the project, do lots of homework, before you start.
Jon.