Diesel vs. gas valve body

Hey all. I've got a '92 diesel 518 (618? Dunno.) non-lockup transmission, and we're kicking around the idea of putting an Ultra Bell on it, to use behind a big block in my friends car. What I do not have are any spare gas RH valve bodies, especially one that's a non-LU type. I suppose when I take this VB apart to clean & inspect it, I could pull one from another trans to compare internals, but I honestly don't want to tear into an already finished transmission...and there could be casting differences, etc, that I won't notice. I'm aware that Transgo sells a special kit for the diesels, but I haven't called them yet to see what the reasoning is for that. Has anybody ever tried a diesel VB in a gas motor application? Or been into one enough to know how different they are?