Vent Cable Question

[JRBECK64]

I put a 63 heater box in my Sons 64 and there is a lever on the side of the heater box that isolates the heater core portion of the box and the vent strait from the cowl depending on which position its in. Now the hundred dollar question is what actuates the lever on the side of the heater core box in the engine compartment? Is it a stand alone cable that attaches to the bottom of the dash or what??? If someone has pictures it sure would help. I have a vent cable that looks like it attaches to the bottom of the dash that has a big V on it but it looks like its to short to fit in the middle of the dash where I would assume it belongs. Any help would be greatly appreciated.

JRBECK64