Yes it had 1 from the factory.
Yes it does. unless someone took it off.
YES they are the same.
yes, as long as it has the same box syle body like an 84 silverado would have.
Drive to an exhaust shop
its goes to the smog pump which pumps oxygen into the cat to help the burning process and increase the cats life
YES.
yes. generally speaking 1984 Chevrolet silverado trucks had a dash in them.
depending on the motor, in all likeliness it is gong to be on the front of the engine to your right, just under the motors left valve cover.
Electronic carb, air injection exhaust manifolds, air injector pump, EGR valve, purge canister and valve, catalytic converter......I think that's pretty close to all of it.
simple answer is no.
on my 84 i lowered it 5in in front by 3in drop springs and 2in drop spindles in the back i lowered it 6in by using a flip kit total price was about 450 dollars
No.