Also something to think about, is with large cams more initial timing has to be run to get a good idle. I'm runnig approx. 20 degrees initial and approx. 36 total with a solid 265 int. and 276 dur. @ .050 with 619 lift. When I first installed cam, I got the same symptoms as you guys got but when I set initial at 20 degrees, I can now idle it at approx. 900 rpm's. Before that I had to set it as high as 1200. But we are talking a whole different type cam. Checking for vacume leaks and timing first will cost you nothing and about 15 minutes of tinkering....
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