Problem...

Out of curiousity. why such a high idle? I think you are lean, but I also think the carb is not set right on the basics. Get the idle to a normal level... If the cams not a huge race unit, it should idle at less than 850 with no effort. If it can't, find out why. Buy a vacuum, gage too.. It will help you se tthe carb properly, and tell you some idea of what the cam size is.

Most of the reason I still had the idle set high is because it doesn't have to be low for streetability or anything, it goes everywhere on a trailer. As of now, it is about 900 rpm, and it runs just as well at idle there as it did higher. Like I said, idling is not a problem just that hard pop.