You now get to learn about the insides of that distributor.
Set the idle timing as mentioned, probably going to be in the 16-18 range, maybe slightly more. You'll be able to turn the idle speed screw out as you increase initial timing. The total could be 34-36 which is a generally safe range for a SB mopar with open chamber heads.
Adjust the mechanical advance to get your 16-18* of mechanical advance and you are likely good to go.
