Hiya,
THey could have some collector value for the bottles. I wouldn't expect much as all the makers cranked out those type display bottles during the 60's and 70's. Another pricing aspect is that blended whiskeys don't command a high price unless they are in the Johnny Walker Blue range.
Be careful of selling any booze online. Many online buyers of taxed/controlled items, (booze, fireworks, ciggs) are law enforcement officers. For example, selling to another person in a different state could put you in violation of state tax laws and possibly delivery to a minor charge. Not to mention since you would not have a valid state/local liquor license in that jurisdiction, could open you up to all sorts of legal headaches.
My suggestion, get a few friends together, grill up some steaks after that play a few rounds of poker while you enjoy some cocktails. After the bottles are empty, stick them on ebay and see if you can cover your listing fee.
My 2 cents,
Tom