Thanks but what do point x and point y means and singel and double spring. I have one spring installed right now, that gave my full advance directly. Its that a singel spring set up or what do singel spring means...

I will look in my msd distributor (which the engine was dynoed with) which parameters I will look at but I think I need full mechanical advance 18 degrees and kick in fully at about 2500 rpm.
What springs do I need?

Also the slots measured 0.470" have seen a table here that stated 15 degrees x 2 for that slot size, correct?

I want 18 degrees advance, should I aim for 0.390" slot size (advance plate). In a mopar muscle magazine article I read 0.370" was 20 degrees in advance plate.