New 408 stroker runs rough at idle

We can get you the exact carb that would have come on it as a dressed engine if you are interested. I'm not an edelbrock expert. But sounds like it's your culprit.
Yeah, if you can give me everything you ran on the dyno with it, that would be great. But first, I want to see if I can make my edelbrock one work. Is there anyone you know that I could talk to that has experience with edelbrock carburetors that works at blue print engines?