Bare in good shape I would guess $1k for a matching, nice date code set. Personal decision but I would much rather have a set of real Mopar 390's on my car that wasn't coded for them than store bought steel wheels that are totally incorrect in appearance. Real 450's have a special appearance that is easy to notice and no one makes a good repro.
I have to agree with Sheldon, unless you have the correct steel wheel (painted in the correct black colour) the reproduction steel wheels really stand out as being incorrect in my opinion.
If that's your decision, okay greatr, but I would keep the rally rims for when you get sick of your wheel choice....
Here's what I mean...This is the same car (a very "famous car"
Which do you think looks better ?