I would say for an engine, probably the Saito .40 if they still make it. Anything in that range. The .56 may be too much. It has a lot of power really. Possibly the .30 if you are really light. My .30 turns a 10-4 prop quite well but not a powerhouse.
What I meant by rigging was the decalage and incidence measurements. that was good he reduced it from the original. I am beginning to think that the incidence (rigging) of a lot of these early aircraft is one of the things the designers were getting wrong. Obviously, they did not have everything figured out back then and from reading pilot reports, they all had to push forward for level flight.