BINGO! I advanced the timing a bit, and it fired right up WAY quicker and smoother. I finished the breakin (20 mins 2000prm, 1 minute each 2500, 3k, 2500, 2000, 1500, 1000). Now I can focus on a new carb, finishing the exhaust, and tuning it all in.

Thanks for helping me work it through guys!