jatoman - The 3.3 is the largest motor you will be able to put in there that doesn't require any custom fabrication.
New@RC - Will the engine start at all? Will it turn over? Is it getting fuel? Check your instruction manual for specific trouble-shooting options.
Flybywire - We run the same engines that are sold as "Draked", or Drake Modified. I've run those engines in stock configuration, and they're great. Awesome power, good mileage, and the stock carb works very well. Just like pretty much every other engine, you would benefit from some good ceramic bearings (I use the TKO ones) but other than that, they're quite durable.