Bill Fink fitted a few LS engines to Morgans, he called it the Plus 8 Plus. A very good and powerful solution by all accounts, but for some reason MMC have never seemed interested in GM engines, which is a bit of a shame. I suppose they might not have wanted to annoy Ford.
But my money for a future engine provider has got to be on BMW. Germany is the biggest market for Morgan outside the UK, which has got to be a significant factor.