My experience last year was that the ST2300 was one strong engine at full throttle, purred at idle and died in midrange. Two others in my club had 2300's with no problems, but not me. The club's Super Tigre bigots worked it over extensively with no success. Great Planes worked with me for over a month, even shipped me a fuel pump to try a fix -- but no dice.

I bought another engine for my H9 CAP (OS FX1.60), but I hated to give up on such a strong engine. I see there is a Conley carb that can solve the problems, so luckily you now have a backup plan if you just happen to have one of those lemons.