I have a few myself that were appealing to me (old Mopar Police Packages) that were inexpensive. It's really a guessing game but generally speaking these don't seem to bring a lot. I'm guessing

entire 70 plymouth line up standard size 8 1/2 X 11 approx $20-$25
entire 71 dodge line up. larger sized 10 X 12 approx $30
entire 70 dodge line up larger sized 10 X 12 $30
pot card of a 70 cuda 340 standard size maybe 3 X 5 with dealership stamp on back approx $25