Stroker engine "diesels" after I shut it down

I don't buy into "high idle" issue. My car is a stick & idles at 12-1300rpm. No converter to lug it down. True 10.13 to 1, ported iron head & pump gas. Does not "diesel" ever. I do agree it could be something with initial timing or carb not set right. I assume the cam was properly degreed in. That can have drastic affects on performance & idling.