Yes, install the throttle pressure linkage (aka. kickdown). This input to the transmission does much more than just tell the trans when to drop into a lower gear. Its nickname has made it seem simpler than it really is.

With the throttle wide open, you want about 1/8" of extra play in the throttle pressure linkage.

Said another way, if you hold the carb at WOT, the kickdown is adjusted properly when you can push the kickdown back another 1/8 of an inch before it completely stops.

Hope this helps.