Dang Dusty, you topped me whilst I was typing

 

dusty, to do so i have to pull the heads and then they just drop in or press fit?

 

not that simple for top hat liners. best done at a machine shop.
the only option that is diy with the block in place is to pin the liners in place

 

These are the serious kiddies for V8 remans but you'll need to dig deep into your pockets.

Rover V8 Engines for Range Rover, Discovery and Defender, remanufactured and new options available

 

Ok so heres a question, i have a friend who told me that i believe it was Buick (?) that made the 4.0 motor? said it was like a 215 or something or other? any ideas? anyways if there is something like that out there, could i just use that instead of using a "land rover" motor? and not have to do a wiring harness swap and computer swap?

 

The original Rover 3.5 NA engine was developed from a Buick 5.25 engine so I doubt much is the same on the 4.0L. As for harnesses I can't comment.