T16 turbo - ive got one in my mk1 escort 240BHP is easy to get - just wind the boost up. i did consider one for the tranny but to get it in the mk1 escort ive had to make my own bellhousing and use the type9, you can get an adapter plate to fit it to an mt75 not a transit one tho, but the input shaft wont be sitting very far in the crank bearing according to my measurments. My bellhousing is about 50mm shorter than standard also im using the xr4 box with the long i/p shaft!
also the dissy would be sticking through the bulkhead and would need the heater or the dissy removing - on my escort ive cut away the bulkhead and removed the heater
personally i cant see many advantages over the V6 24V prolly the only one is better mpg tho it was never brilliant in the rover!! but i reckon the torque of the V6 would suit the heavier van better!