Popping thru carb

Every once in a while, and only when the engine is warm. When I restart the car I'll get a little pop or back fire thru carb, not all the time. 318, mild build, auto, 600 Eddy with electric choke. Never happens when starting cold. Checked for vacuum leaks, timing all the usual suspects, this has been going on ever since I put the refurbished Eddy on. Just wondering ,thanks