They are still available although expensive
All state ag parts has rebuilding kits
Seals etc around 250 but that's just for the gaskets and seals have you ever rebuilt one ?
It is a wet sleeve engine that has a balancer bolted to the bottom of the engine by the main bearing cap it has a gear that drives it from timing gears I always took it off and tapped the holes and put short bolts in the holes it is there in case you want to make it a diesel
I have done several in the past when you knock out the sleeves they have o rings on them when you replace them use anti freeze as lube not grease !