You'll only know if you measure it.
If you loosen the nuts of the MC a couple of turns, is the MC 'pushed' off it base a bit? (This would mean a too long pushrod, prob. not your case here).
If you can lengthen or adjust the pushrod, you should be able to lengthen it so it barely touches the MC when tightened down. Ideallly you want just a little play here or otherwise the brakes get applied and will start to drag after some driving because of pushrod metal expansion by heat.
Hard to tell, but when you push lightly on the brake pedal, do you feel just the brakepedal mechanics moving, or also some springy/mushyness of the MC?
Have a look at Dr.Diff's site and notice a manual brake pushrod should have the rubber locking washer:
Mopar '62 -'70 Adjustable Master Cylinder Push Rod
If you manually pull back up on the brake-pedal, does the pushrod pop out of the MC? (This would be very bad btw).
