When looking at the motor from the front of the truck. To the left of the carb, sitting on the top of the intake manifold. It has 2 hard pipes coming out, one is broken off, and runs to the carb (Eidlebrock 750) the other tube has nothing hooked up to it.

Here is a pic:
http://mantadiver.com/rustedpart1.JPG

Is there a name for this part? If so what is it?
Is this port or manifold vac?
What SHOULD it be hooked to?

 

I had the same thing on my 460 it is for the choke setup with the factory carb.
You have a manuel choke so just plug the lines.
Steve