[Excaliber]

OH, Mallory not MSD. Mallory is much harder to work with and the mechanical advance unit is not at all user friendly or even visible.

You will need a timing light to watch the timing mark on the harmonic balancer to determine if\how much it advances at what rpm. This could be a job for a skilled mechanic at this point.

The questions are:
How much IS it advancing, the TOTAL advance amount?
At what rpm does it START to advance?
At what rpm does it STOP advancing?

If the answers are reasonable and in the ball park, your good to go. If not, see the Mallory Web Site for details on how to adjust the mechanical advance.