I can get 100 octane Sonoco in town so I can run the test with that. I like I have a full tank so I'll run it low and put 5 gallons of the Sonoco in it. I will also continue the search to space the carb up as much as clearance will allow. My other thought is to switch to the 6 pack set up I have just sitting on another engine on an engine stand, will I need a new throttle cable??? 4 speed so no kickdown linkage to worry about.