Clutch
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I bought a factory 22R short block, but it's been several years ago now. Made in Japan. I went with an Engrbldr (Topline) head. I think you are correct that they don't sell complete engines, but you can AFAIK get each of the major assemblies independently and put it together. But my memory is that there is/was a long block part number but couldn't tell you availability.
I didn't inquire about a long block, was looking for a crate engine. Might swing by the dealer out of curiosity about the long block.