I guess it doesn't really matter too much as far as the choke wiring. Though straight 12v to the coil usually means you change points about a set per tank of gas.

Just wire the choke to something at least switched by the key being ON, not on ACC. Best case you find something that is only on when the motor is running, but tied to the key should be ok. If you do it like that the choke will pull itself off with the key on even if the truck isn't running and warming up. You'd have to turn the key off and let it cool down to get the choke back on for a cold startup. Just don't sit with the key on waiting to start it up when its cold. It is better than not having the choke pull off at all though.