318is 16v into 1990 318i 8v

[dacky20]

what needed to put a 318is engine in my 318i 1990 ?
am i missing anything here ?
engine (obviously)
ecu ( do i need the loom )
engine mounts
any help would be great ive decided to stick a 4pot engine
and what would be better m44 or m42 ?
cheers tim