RCBOATMANIAC

Well I know that there is probably already a thread for this airplane, but I just have a few questions to ask to get ready to build the plane. First I am looking to power the bird with a 4 stroke, currently I have a O.S. H-80 Max setup to go into the plane, but now that I have gotten my hands on a few Saito engines and I like the performance they offer. So I was considering using a Saito Fa 125 so I could also use the Keleo Creations exhaust system for it, but I was wanting to find out would the Saito 125 be to much or be just right for it. Second for scale appereance what size prop should I use for proper scale looks since I know 4 bladed props are hard to come by without a heathly price tag to go with it.