Yes, there's one or two examples on here of people doing this to Land Rovers There was a bloke called
@aaronmorris a few years ago who provided a lot of pictures too. Unfortunately, the Cummins engine he used was a little worn out, but all the mountings, pipework and transmission adaptations were very well detailed and neatly done.
Now that Cummins conversions are rather passe, I'm going to offer a kit that allows you to fit a vintage JCB 3cx engine and gearbox to Land Rovers. It'll be a winner. The front propshaft even comes out on the correct side of the gearbox. I'll cut out a load of bits of 3/8" plate and call them 'self assembly engine mounts' and throw in a nice brushed stainless steel finisher for where the exhaust comes up through the bonnet, and it'll be the ideal Christmas gift for the Land Rover lover in your life (JCB not included).