I have no idea what to do on the 67's, but there is an article in the tech archives or tech reference section that deals with converting 70-72 chevelles. It may not be applicable, but it may give you some idea.
I did this to my 69 without buying a new harness. Check my fully illustrated article on my homepage under Tech Tips. It should point you in the right direction. Let me know what you think.
Josh Gin (NoNeck) Visit my Chevelle website http://www.NoNecksChevelle.com
Team Chevelle #752
A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!