You'll need a 67-70 throttle shaft for the qjet. I see repops for $79 that come with the choke linkage. You probably will also want the throttle extension that bolts on the new shaft (Ames has them).You also need the bent vent (one only) choke pull off, they run about $49 on epay. They have the short shaft and are metal. The throttle return spring attaches to a bracket that bolts onto the intake on the drivers side just aft of the carb. It also doubles as a wire loom. I dont see those aftermarket (im looking for one also) so you'll need to make something up.
If you change out the throttle shaft, make sure you grind off the staking on the butterfly screws or they will break off.