how often rebuild carb?

I've been driving as much as I can with the newly rebuilt Holley. It's night and day better. Not one adjustment, and all is perfect. I'm very heppy with the Kar now. I'm going to concentrate again on driving my Kar more. I had fun showing it for a year, and won more competitions than I could have predicted. I simply have more fun driving it, so if/when I find a good deal on a 4100 I'll consider it. Until then, the Holley stays..