I finally finished this thing. I was able to locate the last bearing/bushing, metal crank pin #1 in Australia of all places and got In. & Ex. Valves from them as well. The parts were Japanese but not necessarily Kubota so im unsure but they were quality parts. I sourced a new crankshaft, used rods almost locally and all the seals, gaskets, pistons, ring packs main bearings, rod bearings and bushings from good ol' Messiks. I installed new valve guides, reamed them, I re-cut the valve seats, new valves, glow plugs, and re-sealed the chassis so there's no mess when its parked. I was also able to find NOS fuel camshaft kit on eBay. The sleeves on the other hand were no more than .0002" out of round. I was absolutely blown away at the fact.