Gregory-
On these forums you will receive lots of great information from many experienced modelers. We are an opinionated lot and enjoy a good modeling discussion where we can talk about our favorite subject, after beer and women of course!
To get the best info out you must provide more info in. In other words, you told us which engine you have and you later gave us a little more info on what exactly you are trying to do.
So if you want to know what prop would work on your Corsair it would be very helpful if you told us a bit about the aircraft. We need to know the wing area (or the manufacturer so we can look up the wing area for you) and the weight of the aircraft ready to fly. If you don't know the manufacturer could you tell us what the wingspan is, and maybe the chord or width of the wing about 1/2 the distance from the fuselage to the wingtip. With this information we can compute the wing loading and power loading which will help us come up with a selection of props that will most likely provide the performance you are looking for. There is even a good chance that one of the gents on this forum has the exact airplane and engine combo that you have and can provide some ACTUAL info for you to consider.
It's difficult to provide too much information when asking a technical question. Give us something to work with and we will be happy to help.