Let me clarify, I'm being told by a local speed shop that this set up won't run on pump gas due to high compression. I also know that you can back off timing and make it run on pump gas but that's defeating the purpose. From the calc's I've done dynamic comp ratio is around 9:6:1 but I have know idea how that compression will react with pump gas under a constant towing load. Just don't want to grenade the engine with predestination