Remove coolant cap, allow engine to get to operating temperature, turn on heater full blast and patiently wait for air to escape system.
No they will not.
Yes
depending on model of truck.
Diagram of 1990 chevy truck steering column
yes, they should be identical.
Yes it will.
Which engine?
That would be the 700R4
In the truck!
NO. It has a cable.
Yes they will.
distirbuitor, wires; most likley. Just go through the whole ignition system.