OPINION ON DISTRIBUTOR

The vacuum advance is a moot point as the only time it operates is at part throttle. It's job is to clean up unburned gasses at part throttle (which also increases mileage) and to offer a little part throttle acceleration. That's it.

It's not uncommon for total advance including the vacuum advance to be over 60*. Yours is fine.

You do not tune the distributor with the vacuum advance connected anyway. Get the engine the initial it wants, then limit the total mechanical to between 34-36 degrees. Then plug the vacuum advance in and forget it.