I purchased a pertronix plug and play distributor for my 67 440.. I just threw it in to get the car running and now I am playing with the advance..

The lighter springs for more advance quicker is a no brainer but there are 3 sets of Mechanical advance limiters.. They are small L shaped pieces of metal that fit under the springs.. What has me thrown is after taking out the rotor there are no advance limiters already on the distributor.. Do I need a set installed?? Without a set installed will my mech advance advance too far?? A little lost here..