I've got the Wasp 28 in mine. can't say too much about the power, i haven't gotten a race tune on it yet.
but, i can say it's a pain to put clutches on it. the carb boss is very close to the front of the engine, and if the flywheel has any sort of dust shield it has to be ground down to clear the carb boss. I had to take about .125" off the stock lst flywheel to get it to clear the carb boss.
so, i would say go with something else to avoid that headache.