It may be a DC/MP vac advance distributor based on what I can see of the number.
If so, its already got a pretty good curve in it.
If you're dedicated drag racing, then the vac advance isn't needed and in that case, using a lighter primary spring may be an advantage. You'll then need to be sure there is enough initial tension so the advance is stable at idle speed. Leave the heavy spring installed. That's part of the secret of why the MP/DC distributor are better than most aftermarket.
A heavy secondary spring normally is used to slow down advance as the rpms get into better combustion above roughly 2000. But it also is used to offset electronic switching time (slew rate). see https://board.moparts.org/ubbthread...ry-unilite-timing-issue.html#Post2488504


If you're not dedicated drag racing, then work with the factory springs - especially if it is a DC/MP distributor. You can tweak the tension on the primary, and the engagement point on the second spring by turning the spring perch.

If the advance is really too long - say because a long duration cam is being used, then weld a tack on the inside of the slots. File it and you're done.
If its not a MP distributor, depending on the original application you may find a really long advance, like 30*. In which case, weld a tach and file it to length.