I have 2 of these engines (horizontal shaft, 422400) with rods and cranks out of them. I got a Vertical shaft engine from a member here hoping to use the crank and rods for one of these. Well, the Vertical crank has a much longer end on the PTO part of the shaft. Tomorrow, I am going to talk to a machinist to see if he can shorten that shaft to the horizontal specs. Everything else on the cranks are the same. Here's a pic of the two shafts.
I have the manual showing the different cranks and specs for them. I printed out copies for him to take with him if he can/will do it. Hopefully, I can get one of these engines running again. I think I can use the vertical block and just put the horizontal pan and cover plate on it. Won't know for sure till I start putting it together.