I'm in the middle of changing, welding up the advance slots on several stock Mopar distributors(non Mallory)to reduce the amount of mechanical advance. I have found most BB Mopars will start really well with 18 degrees or less BTDC and run very well with between 34 and 36 total mechanical advavance. I shoot for 14 to 18 initial timing and 34 to 36 degrees total Most of the stock Mopar distributors I have worked on have the amount of advance stamped into the bottom of the advance plate, most of mine say 13, look at yours and go from there