Distributor springs

It's not the limit that's the problem, it's the governing (restriction) getting TO the limit that's the problem.

My distributor has adjustable stops to limit the maximum advance that can be had. Springs don't limit total advance. I have the distributor set to 20º now, but it gets there too fast. It's 'all in' well under 3krpm now.

Not to be pedantic about it. I'm sure you know all that already. That you asked about an advance limiter when I'm asking about springs means something got missed.