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https://www.steelsoldiers.com/threads/what-have-you-done-to-your-hmmwv-today-lately.147917/page-29#post-1909168
https://forums.g503.com/viewtopic.php?t=19740
There are a few others IIRC
A few have done it, certainly
https://www.steelsoldiers.com/threads/6-2-diesel-to-454-big-block-gas-burner-swap.158781/
I just realized that's in the CUCV, there are several of those threads. I'll search again. I know it's been done.