Mongo said:
It's when u try and put a NON-LR motor into a D2, that's where it get's complicated...
I still salivate at the idea of swapping the LR block for a Buick 350 V8. I beat myself for not having measured up the bolt pattern on the old block I tossed away - but the BOP pattern is well-known.
The Buick 350's low-end torque is unbelievable, compared to a Rover V8. I have one particular "test" hill on my way to work - Disco (on 265s) cannot keep the speed up to 50 at the top of the hill in the 3rd gear; LWB can - but barely, and only if I take off near 65-70 at the bottom of the hill. The jeep with the 350 - start at 55, exit at 55, no movement of the gas pedal.
Of course, everything comes at a price - it's 10mpg vs 13-14 of Disco's and 15-17 of LWB.
And, of course, not in a D2 - it can only be done for 3.9/4.2.
As far as diesel conversions, I'd buy a diesel wreck from U.K. and have it shipped here, and do a body swap. P.T. should be able to cast some light into what's involved.