If you read the pryor page where I ran the MAGNUM 1.8 with gas/glow @ 10 % oil, you'll find out that running with 10% oil mix instead of 3% will run very good but we still need a walbro carb because the original glow fuel carb is very sensitive to adjustment.
I've read somewhere of a glow fuel manufacturer makes a special fuel for big supertigre engines that contains only 6 or 10% oil and based on that information I went ahead and made my fuel mix @ 10% oil.