the m20 and m50 have the same bellhousing bolt pattern, i am not sure about the difference of the amount of tilt of the motor, you may need to tweek the shifter and tranny mounts to deal with a slight change in how the tranny sits, i've not done that swap, i have put a e36 318i close ratio 5 speed into my e30 325ism as a experament and i had to twist the selector rod a little to get the shifter to sit straight, it worked fine but i missed not having a overdrive so i sold it as a package (with the low gearing of the tranny it came off the line like a bat outta hell but 4k at around 70 was a bit much) the m50 has less tilt then a m42 so you shouldn't have to bad of the time hooking it to a m20 tranny
all america wants is cold beer warm cat and a place to take a poop with a door on it
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