Attached is a pic of a K341-S Spec#71309
This engine is installed in a 782 that I picked up a while back. You can see the the base/oil pan has a flat bottom and flanges for the mounting bolts. It also has a fuel pump. Crank diameter is 1.125". Width of the base is approx 11.5". Doubt that the base/oil pan could be altered or replaced to make it narrower, as the block has the flanges cast into it.
Another thing to look at is the fact that the flywheel shroud does not have the oval cut-out for the AQS air cleaner tube! Cub may have been the only manufacturer to spec the "supercharger" cut-out. But, I'm not certain.
Guessing that it came out of a Gravely, but I think(?) that JD blocks are the same. It's not impossible to get one to fit a Cub, as I have seen it done on a 1450 (NF would be a whole other talk show). Just not sure if it would be worth the effort on your part if you were only looking for a rebuild project.
Bottom line is that I'd look for an AQS engine. There's my two cents!
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