My power locks are attached to the ends of my arms...
Ok. Dumb joke reply out of the way, there are some interesting pitfalls with power locks on these old trucks.
To start with, what year are you looking at? Are you aiming to have keyless entry? Or just be able to lock/unlock the opposite door without reaching across?
Example pitfall: On my 58, the lock that you can toggle with the key from the outside is completely divorced from the lock you can toggle with the lever from the inside. You can open it from the inside with the outside lock engaged, but you can't open it from the outside if *either* is engaged.
With a bit more info on your truck/goals, we can give you some better advice.