Here is the link to my 4m41 transplant into a Gen1 LWB.
If you use a 4m40, it will be easier, due to less electronics.

Since the two blocks (4m40 and 4m41) are virtually identical, most of what I posted will apply to the 4m40 as well.

Don't ascribe to malice anything that can be adequately explained as stupidity!
Pajero LWB Gen1 3.2 Di-D TD Engine
33" Bridgestone D694s
2" Lift
Front Runner Rack