[sixtiesmuscle]

The response from Joel when asked if Motion added any MP numbers or designations to the CE blocks was "not normally". That confirms what I have observed on the blocks in my Motion cars.
Also, my recollection of "back in the day" was that we didn't care what number was on the block, and, if a motor needed replacing under warranty, so much the better. Nobody gave much thought about the original block adding any value, especially 30+ years down the road.