Just pondering out loud here - V8, 2.5D, 200TDi, 300TDi, 2.8TGV, Daihatsu, Perkins have all been done to death and are mostly pretty old hat (some older than others).
I liked Marko Cosic's Rover Twink just because it involved something that bolted in using pretty much off-the-shelf parts and performed really rather well.
So, does anyone have any suggestions for engine conversions that are potentially doable using either the parts-bin or existing adapter plates without having to whittle an adapter plate out of raw billet?
Off the top of my head:
Some pug engines supposedly fit Sherpa bellhousings (LT77)
We know at least one Rover car engine fits a LR bellhousing
Cossie V6 fits Cologne(?) adapter plate
Does anything new (Zetec etc.) fit the popular Essex V6 plates?
Jag AJ6 supposedly bolts to a ZF 4HP auto box, anyone know fo' sho'?
A mate had a Nissan diesel in a 110 which went OK, but a VQ35DE or SR20DET would be more interesting, and the tuning potential of some of these is mahoosive.
On the same lines, Supra 3.0 V6 TT or Skyline RB26TT, or for a cosic-stylee perhaps a Toyota 4AGE?
I'd also add that I'm not especially interested in big yank iron with huge numbers as these take you waaay beyond the design specs of the rover transmission. I'm aiming at stuff that gives similar or better BHP/torque in a more modern, smaller, lighter, more efficient package.
I guess a good criteria is that you could either buy a running engine, or a complete donor vehicle, from eBlag for under £1k.
