Well, today I officially gave up on my idea to install the Saito 130TD. Mostly it was an exhaust problem - couldn't get one routed to the right spot and the headers I had (stock and keleo) would not allow the engine to fit inside the cowl properly. So, heck with it. I ordered the OS FS91. Looks like an easy installation and Mr. Pettit says its plenty of power for this bird. I'll save the Saito for another day.
BTW, my RV-4 ARF has arrived in top shape and.....wow, it's purdy!