Pardon this extremely stupid question, but where exactly is the stock sending unit for the temp gauge? I want to replace it with an aftermarket one. I have the 360, if that should help.

 

You mean I can help someone ??? The temp sender is in the intake manifold. In front of the carburetor.

 

More specifically, Standing in front of your truck if you will look at the thermostat housing and use it as a sort of a "clock," you will find it at about 11 o'clock position. It will be about an inch or so away from the thermostat at this location.