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I have a TH350C in my 72 and one in my 85. I didn't install the tranny in my 72, but whoever did it wired the lockup function to an extra dimmer switch in the floorboard. This works, but it isn't the proper way of doing it. My 85 came from the factory with a TH350C. The lockup function on it is based on engine vacuum. There is a switch on the firewall right next to the brake booster that is hooked to manifold vacuum. There is also an inline restrictor to keep sudden vacuum changes from actuating the switch. When manifold vacuum gets above a certain point, the switch closes and the torque converter locks up.
I am not sure how this is wired, but you should be able to get a wiring diagram for an 85 C10 and use that for reference. It shouldn't be that big of a deal.
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