There were about 5 thousand non turbo SD33 Scouts sold '76 to '79 and about 5 thousand turbo SD33T Scouts sold late '79 and '80. There was also about 5K CJ10a towpigs sold to the military, both turbo and nonturbo. Overseas many thousands of CJ10 trucks and Nissan Patrol vehicles were sold. It is a very common engine in Australia especially, so rebuild kits will always be available just at import prices. The SD33 is also a common forklift motor here in the states, so a couple companies specialize in their parts. The Turbo block is identical to the nonturbo except for a special set of oiling holes for the pistons.
I'm sticking with only Turbo blocks, but realistically you can put a Mercedes turbo on a regular one and be okay. My Scout actually has a Mercedes turbo already on it for the extra pound of boost. It's a direct fit. I'm also curious if those holes can be added since the block is an industrial motor. When you rebuild it the entire sleeve pulls out around the piston. How cool is that?
In comparison there are 5K Eagle Kammbacks made, about half as many as diesel Scouts made. There have been about a dozen Kammbacks for sale this past year, and I own two, so thats really not that rare. Heck I found a guy near me with six SD33 Scouts he's collected from a local junkyard, another daily driven SD33T short Scout near me, and another guy with two CJ10a Jeeps for sale close by. If you look, you will find.