Carburetor linkage Questions for 67 Dart

so just to be clear, in 71 or 72 chrysler reworked their valve body in the trans (someone here knows the year, please chime in!). This is true for 727 and 904. Prior to that to get kick down (shift into "passing gear") required you to floor the accelerator. After that, there was a tuned kick down with a less than fully depressed pedal that was variable. You can install a later valve body into an earlier trans and it can be done in the car. Many manufacturers sell fully automatic valve bodies for a transmission that you want to update that also provide crisper shifts and less slippage (less wear and tear and better mileage). My favorite is the Cheatah Valve body available from A&A Transmission.