The show is filmed here in the northern Illinois area and I've seen a few of the cars they worked on at events. I was at a big cruise where that custom '68 I think it was, Barracuda made its debut. I remember it rolling in with cameras around and a bunch of hoopla. On the show the scenes from the cruise lasted about 30 seconds! It is actually a pretty nice looking build. Some of the cars they do look sort of cobbled together in the episodes though.
A local gearhead friend of mine was telling me recently they were near his house and he went over to watch for a bit. I think he said they were working on a Pantera so watch for that in a upcoming episode.
Ryan Auto Archeologist here on Moparts hangs around with them on some of their builds I think.