I'm the guy who modded the AC Cobra 427 into a 289 just recently. It wasn't that difficult (I got lucky) and it has made me want to try something else like it just for fun. If we had a Triumph TR6 (which would be fun as is) a really fun mod would be this real-life example....
https://www.hagerty.com/articles-vi...anity-is-a-bmw-m3-powertrain-in-a-triumph-tr6
https://www.hagerty.com/articles-vi...anity-is-a-bmw-m3-powertrain-in-a-triumph-tr6