I suspect you have a 192 cubic in industrial engine. But the only difference between a 172 and a 192 is the bore and possibly casting (D3JL = 192, D2JL = 172 per a rebuilders parts list) both are 1970's vintage.
See the link for decoding the casting numbers.
The J on the end is often used to identify the size. C for 134, J for 172. I have no info on it other than the link says it is the engeering version.
The only way to be sure is to measure the bore. A 172 will be close to 3.90, A 192 will be at least 4.125, likely more with wear.
BTW - If the previous outfit has never been inside the engine they wouldn't know the difference. Everything including head, rods, crank, and bearings is the same between the 134 and 172, bore is the only difference. Only other difference I know of in all the years production was the switch from sleevs to sleeveless around 1960. My "GUESS" is the 192 is the same way given the thickness of the cylinder walls of the later blocks. There where some updates like a nut vs. a spring clip, gear vs. rotary oil pump, slot vs. hex dist drive, etc.. but for the most part the main castings changed very little other than the move to sleeveless.
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