Help with my wheels 68 Dart

Welcome to the site...Ventura, nice ! I surf there alot.
Your car should have come with a 14" x 4.5" steel wheel, with the 4" "small bolt" pattern. So if you have 13" wheels, thats odd.
Look for a set of 14" x 4.5" steel wheels or better yet, a set of 14"x 5.5" steelies that came on the 340 cars. Pair that up with a 205/70-14 or 215/70-14 tire and your good to go.