Robert - you learned all that from this Forum!!!!! Wow, you're definitely talented. That K321 block with the ears is probably from one of those GREEN machines we don't often mention. I believe there is an FAQ with pics of the 3 various style of block bases that Kohler made.
It looks like your 147 was converted to a manual armstrong lift. In my view it's better that way, but several guys on here really like their 147 electric lift. I happen to think the hydro lift is really the best. I could just never really see using a little toggle switch to raise/lower a blade or tiller.