Do search on the four stroke list for posts by Bob Reeves, or look up his set up on the Tulsa Gluedobbers web site. It's basically a small diameter intake, large diameter prop with high pitch and low RPM. On my Saito powered Score, I run a 13-6 or 13-7 and have a take off RPM in the 7500 to 8000 RPM range. I discussed this with Gilbert Berringer at Oshkosh several years ago, and it's similar to his preferences and he used a 5 to 6mm ID venturi. Bob's set up uses a screw into the side of the intake to allow you to adjust the choke area and it works out about right where Berringer's numbers were. For props I have used Zinger, Vess, and Rev-Up. Just be prepared for something different! If you go this route you will have to forget a bunch of stuff you have learned and gotten used to over the years! I haven't sold all of my two strokes just yet, but the four stroke is an interesting power plant that you just have to get used to, just the same as taking up electric.
Good luck and have fun,
Dan McEntee