1969 Race Dart w/ 426 Hemi- garaged for 45+ years

Date code on tires? Where would that be located?
Along the bead and stamp into the tire, not raised. I believe it is just a number. The week and last number would be the year. I'm sure the tires are way outdated. I would buy new tires and save the old ones until you can find more history of the car. Nice project you have here.