As Ed pointed out, I run the 1235 (14.5" x 14.25P)with the RPT-1 motor and have no problems with 3k+ ballast, 4k+ it takes a few seconds to get on plane but no problems, any more ballast than that and the boat is real low in the water. For I think it is 03 and above, Mastercraft went with the splined shaft which would be part number 1285 (not 1234, which is RH rotation).
Lost a bit of top end but since I ride the dirty D, there is not a lot of just cruising time and the hole shot is worth it, the boat comes out of the hole and on plane effortlessly. With no ballast you have to be easy or you'll tear the arms off a beginner.
Paul Brothers who posts on here did a write up on OJ's product the edge which he is running and seems happy with. You can also talk to with Bill Weeks at ACME (www.acmemarine.com
) and he'll set you up with the right prop for your application.
Awesome boat and my favorite wake. Next time you're up here we'll head out.