Vintage suspensions require all the attention one can muster. Good components, then initial setup, including sag% etc.
My goal is to use as much travel as possible and every weekend spend time working up to that. (as closely as possible) Our total travel is 116mm (4.5") front, 79mm (3") rear. O-rings on fork tubes and shock shafts allow us to see what travel is being used. Even though by vintage rules, we're limited to very "basic" adjustments, we still should make suspension as much a priority as possible. It counts towards better lap times.
George, static measurements will only offer a partial amount of information, but it's a start in the right direction.