RE: What do you think of these NTC3's?
The Novarossi powered MTC3 (if it works) is what you are looking for then. The engine looks to be a rear-exhaust, and most Novarossi rear-exhaust .12 engines currently in production are putting out about 1.5 Hp. Even the side-exhaust engines are putting out +1 Hp (i've got one).
Either way, they are easy to tune and very reliable. If it works it will supply more than enough power.