If you're after a tailwheel, back-country C150 on steroids, it would probably be better and easier to build something like a
Bearhawk, or
Murphy Moose.
Assuming you are in the UK, you wouldn't get a C150 on permit and the practicalities of your proposal in terms of weight, balance, useful load, Vne increase etc would render it virtually out of the question and probably more work than a kit-built project.
I don't think either of these have yet been cleared on permit in the UK, but that's not too much of a problem for a well designed kit-plane. Either would be a good recipient for your engine.