I can't believe I can't figure this out from my manuals, but nothing seems to indicate at what RPM you should set your timing. It says 6 degrees BTDC for my '66 289 with auto with the vacuum line disconnected, but at what RPM? I believe I've got a dual advance system (centrifugal and vacuum) and I've got single points. Actually, the distributor is a C8CF A (from a '68 I presume) if that helps. Thanks for your help with a baby question.