'66 dart parts?

Pull the door lock cylinders out and have a locksmith repin them to match your ignition key. Simple job, if you were here locally I'd do it for you for $20. On the clutch, I'd find a recommended local clutch builder and have him redo everything for you.... pressure plate, disc, along with a new T/O bearing, and pilot bushing. I'd install a new input bearing in that transmission too if it were me.....those are the first thing to go bad in those 903's. Find a nice quiet spot and with the engine running, let out the clutch with the trans in neutral. If you hear any rumble/whine/noise of any kind, I'd go through the transmission with all new bearings/gaskets/seals.