Nope - the only clutch pedal stop is the firewall panel itself. All you're doing as the pedal goes to the floor is lifting the pressure plate a bit further back from the flywheel. No harm done as the linkage geometry can only move so far.
Some people argue we should enjoy these automotive relics as a period piece of engineering history in the evolution to our modern automobile. What is "Not right" and awkward to some, is "character" and historical significance to others.
If you really want to finesse the clutch engage position, the clutch throw rods are hollow. Take one into your favorite machine shop, cut the rod into two equal halves, then tap threads for a 5/16" threaded rod into the interior of the clutch rod halves. Screw both rod halves on to the 5/16" threaded rod, and lengthen/shorten as needed. This will allow you to "move" the clutch pedal engage point forward/aft as you desire, and it will take up all the accumulated slop in the linkage due to pivot point wear.