When talking about mechanical advance and vacuum advance its not an either or decision, it's mechanical advance or mechanical advance plus vacuum advance. Mechanical advance is rpm dependent while vacuum advance is load dependant. For a street car you want both unless you have a big cam that does not produce enough manifold vacuum to operate the vacuum advance at cruising speeds then its just baggage along for the ride.
One of the Mopar Performance electronic distributors will have adjustable mechanical and vacuum advances that will allow you to dial in your distributor. Or, as mentioned above MSD plus Mallory, Accel, Pertronix, etc all make fully adjustable distributors that also include the control module inside the distributor housing, these are typically referred to as ready to run.
Just remember, if you have modified your engine (more compression, bigger cam, different heads, etc.) the factory recomendations for timing are null andd void. You will need to dial in the initial timing, the total mechanical timing, the rate the timing comes in and the vacuum advance to get the maximum performance from your engine.