I have an 85 22R with a Weber Carb. I only run premium (92) fuel
I had an 84 22r with a weber, cam, header and exhaust. I set the timing at stock and ran mid grade fuel. On a side note, that thing was a fuel miser when you weren't looking, but as soon as you looked at the gauge it would go down. Really. No, my commute went uphill alot, and as soon as I came downhill into town bye bye sweet gas mileage. It was prety good around town though for the setup.