Well.... there is a long answer to a seemingly simple question.
If you want to just swap engines, yes, the QL motor is the one you want. But you will still have to change some parts if you want to keep it somewhat original. I'm going off memory here, but I think the mufflers and muffler boxes are different, but they will interchange. Either way, a QL exhaust will likely work fine as it just exits out the front. The ignition system is different between the two, so wiring will be involved to power the battery ignition system. Easiest way is to change the ignition switch and do some minor wiring. Rest is the same.
Now, you can use a later K series block if it has the holes for the electric PTO and for the dipstick, although, it isn't a big deal if it has the dipstick in the top right corner, or if it is on the lower front right side. All the parts on the M10 will interchange to the K series block, so as long as the block you find has PTO and dipstick holes, you don't need a complete assembly. A complete motor from a pre QL series will not necessarily work, and you can't use a S/G motor unless you change it to a starter/alternator motor.
Make sense??
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