Give Galen Govier a call. If I were you I would purchase his Production and options code 69-71, Part and Casting Numbers book 62-74 and the 1970 Plymouth Cuda Option and Accessories Report. They all contain a wealth of information and detailed info you will need for your restoration. His contact info is as follows
Galen Govier
37002 Sand Burr Lane
Prairie du Chien, WI 53821
phone 608-326-6346
website
www.gvgovier.com
Hope this helps