I Need help 410 Stroker timing Carb Education

38 degrees is too much for a closed chamber magnum head for all in IMO. Run max advance around 34-35. Run whatever initial gets the transfer slots happy and the idle speed you want. Then for a street car, bring vacuum advance in. You could probably bring 15 more degrees in for cruise MPG. FYI @AJ/FormS is right on again IMO If you had to back up the cam that far it’s the wrong cam.