Valk, here's a link to HEI conversion info.
http://www.chevytalk.org/fusionbb/showtopic.php?tid/261743/This guy, ignition man, is an expert on every aspect of the GM HEI ignition and has posted numerous times on how to optimize it. There are many simply accomplished tweaks that can be done, for example simple parts to optimize the centrifugal and vacuum advance curves for your particular application.
If your advance weights have plastic bushings NAPA has inexpensive replacements.
