What size tire?

Now you are going in a circle. Your question asked for an available, inexpensive alternative to your 245-60-14s while staying with 14" wheels.

The "Profile" should be about the same, both tires are about the same height as what you have and would be on the same wheel.

If you went 215-70-14s all the way around the fronts would be just a little taller (more side wall showing) but wider. The rears would show about the same amount of side-wall but be narrower.

The tires would look close to the same size as the ones on my car.... Mine are re-pop E70-14s. The stock tire for a 68 Formula S.

You can see them in this thread.

http://www.forabodiesonly.com/mopar/showthread.php?t=62079

Like I said...... Your options are limited.