440 series 26 mallory duel points dis...points issue

I like what yellow rose said.

On the points at jegs, one has 28 oz spring, the other 48 oz. I would think the 48 oz could load the top hat enough to retard timing rate. The uni-light is optical, so no loading, the advance rate may increase. They do not provide detailed info to make an intelligent choice, likely an msd marketing strategy.

I would base line RPM, vs timing before and after, then make advance changes if necessary.