I would think any onroad header will work ... I'm using a Werks ... a few things to note on the Hudy Breakin stand:
*I switched the throttle linkage to the other side so that I didnt have to keep rotating carbs
*They suggest not running an air filter ... you will get blow back from the prop and it will blow fuel all over the engine ... the Revo 3.3 filter assembly will fit and clear the prop
*the wind caused by the prop will drive temps on the engine down ... I would recommend a Competition Heat Engine Warmer and at very least build a shroud with aluminum ... pm me if you wanna see a pic