I didnt run it for an hour straight. I ran it for about 10 mins, shut down, let it cool, then started it again. I really wish I had a plane ready for it. It would be much better to break it in in the air. I guess thats this winter's project...
Depending on the day, I might run the engine again tomorrow. I took a different intake manifold, and drilled it out to match the same size as the carb. The other one was just a stock manifold. It might make a bit of a difference.