The LI'l Hacker is virtually indestructible with the Norvel on it. Not Nationals level performance, but I assume you want to learn what to do before the NATS. To equally matched planes can give you a lot of combat flying in a couple of afternoons. You will probably have to build up a couple of needle valves using the 124 tpi NVA's from the backplate of a Cox product engine(the one with no tank). Solder on a piece of brass tubing to make a T needle valve(don't block the fuel hole) onto a strip of 1/32 in brass.
For better performance Larry Driskill's LiteHawk is pretty good. Not as sturdy, but lighter and turns tighter.
If you put a 4-4.25/3 cut down Cox black prop on it and 25%+ nitro is will fly close to what a Cyclon or Profi will do on the same prop. The BB engines do go faster on purpose built glass props($5 a pop), but the planes are already too fast even on 42 ft. lines.