which distributor?

Accel 59301[ame="http://www.amazon.com/ACCEL-59301-Performance-Replacement-Distributor/dp/B000CIEK4W"]Amazon.com: ACCEL 59301 Performance Replacement Distributor: Roy Hamilton: Automotive@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41M--v7LLeL.@@AMEPARAM@@41M--v7LLeL[/ame]

It has adj vacuum advance and there is a kit you can buy that adj the mechanical advance. Best thing I've got for my car (except for the electric cut outs).

The kit comes with keys and springs that give the correct gap. Super easy to tune.