Yes. A brilliant builder/machinist named Ian over at SM ran a LPG setup on a 7M for quite a while. EVERYTHING was built from the ground up for running it. He just couldn't make enough power with it to satisfy himself so he eventually ditched it. He's now working on a twin turbo LS6 setup, IIRC. The guy does some absolutely insane work.... and it's all a work or art. Look up his builds on SM, "IJ." (not 1J.).
Personally, I'd be more inclined to go with E85. It's easier to convert over to and a lot easier to tune for. I have driven or tuned a MKIII running it but I have worked on some other conversions and it runs quite well. I'm thinking about going that route with my MR-2.
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