I pulled an M44 from the scrapyard with 90,000km on it. It's mint inside, doesn't need a rebuild at all. But my Dad is keen on a project so has been refreshing it for his E36 318is.
A bit unrelated to the rest of the thread but we took the disassembled motor to my Dad's friend from when he raced porsches. He used to build the porsche race motors, but more crucially he also built the super tourer S42s, S14s along with many M42/44.
I noticed these nice looking boxes in his garage while we were there.
Full set of S42 pistons, rods, cams, bunch of other parts too.
Porsche 962