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I think the internals will fit any of the cases, but the bell housing bolt patterns are different. The input shafts will also be different, and if you have a small block gas version, it will be setup for a concentric slave cylinder instead of the external used on the diesel version. Here is a link to ZF's website where you can find exploded diagrams, etc. (scroll to bottom of page) ZF Friedrichshafen AG | Catalogs
The number of clutch splines may be different and possibly the pilot diameter and length. The gear tooth count is different due to the ratio differences between the gas and diesel versions too. I've only worked with the small block version, so I'm not sure exactly how the two compare other than what I've picked up here and with the parts list.
thank you for the link. Since I have access to all the equipment needed, this is not a bad idea. Although, I have read the other posts discussing new weakness around the bell housing, I believe that by welding some structural supports in those area might resolve that issue.