Stroker engine "diesels" after I shut it down

Initial timing affects carb , carb never affects initial timing. Most every carb idle issue I ever come across is not a carb issue at all, it's a timing issue causing the assumed carb problem.

Quick test before you do anything else. Start the car, loosen the dist hold down and turn the distributor body a little bit counterclockwise. If the engine picks up RPM, it wants that additional initial timing or more, now you know what you need to do. If you have a vacuum gauge use it to see how far it wants the initial. I have run in some cases, as much as the starter will handle without kickback.