I've been running an original SBM mopar hilborn on gas for 5 years. Nothing I would consider trick, its a 366 that makes 625 horse.
It is a rare piece, talked to Hilborn @ PRI a few years ago and they concurred there were few made. They believed low hundreds but didn't really know. One stated they only did a run for Indy car and since they didn't sell they melted a lot back down.
It was a learning curve, idle setting is real touchy on gas and I don't idle it longer than needed as it needs to idle rich. I run a stick so I can clear it out easily.
If interested you can hear what it sounds like and see it in action here
https://www.youtube.com/channel/UCkounOf0SVon5WNAPrlUN-A
View attachment 1716250358
View attachment 1716250359
View attachment 1716250360
