You are still batting a little in the dark here. Getting TDC is a good start but you still need to know what advance is supposed to be in the distributor that you are currently running. This is the most important figure as everything else emanates from that. Without knowing TDC and the specs for the distributor, you have no way to know what you need or don't need, or for that matter, whether the numbers you are getting are even close to what you should be seeing. Once you know what the base line is supposed to be, and can actually measure that base line with the motor running, then you can sort out whether the distributor is bad to begin with, and if not, what modifications to make to get you where you want to be.
