Anyone tried one of these HEI Distributors?

The initial advance is a bit too quick at lower RPMs. I have found it necessary to limit the base timing some, however it could use more advance at high rpm.

This is good info. I'm curious how you go about measuring this sort of thing. I've never curved a distributor before.

Would this mean that it needs bigger springs or smaller weights? I wonder if it can be modified to allow more travel in the centrifigul advance. Or is it the vacuum advance that isn't sufficient?