I have several Ryobi engines and a box of carbs. Some are from stile saws. What will run good on a Ryobi that is converted to run on gas/glow?

11mm venturi carbs are said to be the best size, as long as it meets that and has two adjusting needles you should be fine. If you have a few that meet that, and some with and without a choke, use one with a choke since the ryobi engines are difficult to stick your finger over the carb on an airframe...