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