According to Kohler
A short block is as you imagined
You will need to swap your altenator, flywheel, rectifier. starter motor fan , blower housings pushrods & head
Some come with the sump ( or top plate in your case ) some don't
A mini- block is supposed to be the same minus the crank.
However more than once I ordered a short block & got a mini block.
A lot of vendors do not seem to know the difference.
I have a good lathe & the landlord has a massive mill ( 1939 Addcock & Shipley No 19 ) can cut 1" deep x 10" wide.
We use it for boring as it is better than a lot of boring machines.
Thus if the rest of the case is good, I mill the old bush area and fit a LG 2 one machined to suit the crank.
The first couple we did we line bored to make sure the top & bottom bushes were in alignment bit we found, indexing off the crankcase joint face was good enough, except for a racing engine
$ 40 for grinding the crank ( per journal ) and $ 20 worth of bronze.
I send the cranks out for nitriding, another $ 25 and we are good to go.
I have stuffed a few but for $ 250 ( excluding my time ) I then have a replacement engine that down here I get $ 900 for