It's the sort of thing I would've done 5 or 6 years ago, especially one of the iron block 5 litre engines, the limiting factor was the lack of them in the UK and no money to spend on finding and importing one, so a 4.2 Rover was as far as I ever got.I'm finding its the same case with the buick stroker in a Disco. Everyone says its easy yet no one seems to have done it.
Edit: Guy asked about a DII...I assume there have been many other projects where a cheep vehicle like a blown motor Disco II has been fitted with a GM V8, but the search engine here doesn't give me a lot to go on. Any leads on this?
GM4.3s get abysmal gas mileage. I have had a 4.3, a 5.0 and a 5.7, the 4.3 is less power with the same amount of gas.The GM 4.3 V6, in any form is just not good enough to be worth swapping into anything at all. To go to all that bother and not fit the V8 is just silly. You get way more power from the V8 with only a little more weight and pretty much the same mpg.
I would love to see someone try to fit a modern, ultra light, 200hp+ 4cyl or 6cyl, direct injection petrol engine into an old Land Rover. The Hot Rod guys have successfully managed to get them running in old iron so it can be done.
Obviously it is possible to install anything in the engine bay if there is physically enough room to fit it in. The only details to work out will be time and money........and on that score, another Rover V8 will ALWAYS win.