What is your interpretation of these advance springs?

Thanks for the replies. Everything seems legit for a standard curve then...it'll make a nice distributor to use if I run an electronic ignition again. I did notice that the springs in my 1960 and '63 distributors are indeed different than this later distributor. The secondary spring does have a loop, but not as long as the later unit, and the primary spring is heavier.

These distributors would be used on a standard 1bbl engine, so I doubt there is any advantage to trying to get the total timing in earlier. It might just create more issues than it solves but you can let me know. Thanks again.