66 Dart lost keyes

Thanks. So if I want to have a key to the ignition as well as doors I would need a locksmith? The trunk is also separate. Correct?
Yep.
Depending on the locksmith, they can figure out the cut on the key. Try and find a older locksmith. You have pins and not wafers in the cylinder. I don't think they make a Lishi tool for the older Chrysler's.
Once the ignition key is cut, it'll work the doors.
The trunk would be the same situation. It's a separate key. The next problem will be finding the correct trunk key blank.
Expect to pay around $250 to $350 to a locksmith for labor and about $50 for the proper blanks.