I think my engine is just about dialed in. Video.

[Hogger54]

So I think it's real close. New set of size .54 jets, and did some fine tuning with the throttle settings.
What do you guys think? At about 1:02 I give it gas, but it kind of stumbles and then backfires. And toward the end of the video it was slightly revving up and down on it's own. What would cause these? Timing?
How does the idle sound? My tach was bouncing all over the place, but looked to be around 500 RPM(it's a 4spd.)

http://www.youtube.com/watch?v=cfusjslqO_0