In summary, all three carbs worked fine. I didn't really notice one that was better than another. The Amazon carb https://www.amazon.com/gp/product/B077M7NYB6/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 was probably the most work to adapt. It did have the advantage of the spring loaded float bowl drain plug. But required a different choke mechanism and plugging/enlarging of two holes. And frankly didn't really see any advantage to the performance.
The other two ebay carbs, #631921 (via ROP) and #631918 seemed pretty equivalent. I could not notice any performance differences. Since others seem to like the ROP (rugged offroad products) carb and have had good luck with it, that's the one I'll probably stick with.
The other two ebay carbs, #631921 (via ROP) and #631918 seemed pretty equivalent. I could not notice any performance differences. Since others seem to like the ROP (rugged offroad products) carb and have had good luck with it, that's the one I'll probably stick with.