I don't know if Yearone or Laysons has repro floor pans for a '66 or not but you might try Stephens Performance, chances are they have some good used ones. They have like 60 acres of 60's and 70's Mopars.
Layson's has them, $550 for a set of all 4 (front and rear drivers and passenger). Those are the ones that you do not have to trim. There are some that fit okay that may need some trimming for 380$ for a set of all 4. Looks like the 380 is the way that I will probably go. Anyhow, thanks for the info!
I'm still going to give stephen's performance a call and see how much or if they have a good used set that they would sell.