Four of the curves are reproductions of Bosch distributors for 1300/1600/1750 engines. I would start out with one of them. They typically provide more maximum advance for the same static advance. Your higher compression ratio may require less maximum advance. The 123 is nice because you can try the different curves and see the difference.
Thanks, Ed. I was hoping you would chime in. I think I'll start with the 4-9 curve and dial it in from there.
1989 Spider driver
1974 Spider restoration project