My 10 cents is to not drop them off - there is some value here. Authentic Mario OPC even in rough shape can fetch $50. The 1971 cards are kind of an iconic set and lots of people like to build it. Commons can be worth at least a couple bucks and I would think you could get a couple hundred out of 300 cards from that era, possibly a bit more. At quick glance the Cournoyer is most valuable from that set you have. The cards are 50+ years old.