Issues

Please start by going to MyMopar and download some service manuals, at least the one for 67 and "whatever you think" the transmission/ engine setup is out of. There are diagrams in there of the kickdown and how to adjust it

MyMopar - Mopar Forums & Information - MyMopar Tools/Reference

Also spend some time browsing through the "Master Tech Conference" stuff, and not necessarily the same year. There are good articles on there about tech issues
MyMopar - Mopar Forums & Information - Chrysler Master Tech Service Conference Library

here

MyMopar - Mopar Forums & Information - Browse MTSC by Topic - Transmission & Clutch