Will the '68 Dart 225 run again?

Since it has been indoors, I think low risk the valves are stuck. There should still be oil in the guides after 7 years, so you might leave the valve cover on. Best to remove the oil sender and force oil thru the passages. I use a small hand-pump garden sprayer w/ 1/8" NPT tube fitting. If you can, spray an oil mist or stream sideways thru the valve cover oil fill port. Fill each cylinder with a few teaspoons of oil or other lubricant thru the spark plug holes. Turn the engine over by hand. If you feel 3 good air spring resistances per rev, you know it is good. Connect the pump inlet to clean gas and fire up.