With our James cowl you will use MT's P-469-3 extended hub. Not sure on the prop model because they do not list specifically the I/O360 Angle Valve engine so it will be either the MTV-12-B/183-50B or the MTV-9-B/183-50a. As a previous poster mentioned Eric Greindl at MT will be sure you get the right prop.
Eric.Greindl@mt-propeller.com Please let him know James Aircraft sent you his way.
For the cowl and induction, we have about a six month backlog so please order it early so you don't have your build held up later on. Don't forget the plenum, the three work great as a set. We are making a new design and mold for the angle valve plenum right now.