The question you ask is too
involved for a proper answer.
You need to go to a car
parts store, and get a
repair manual for your car.
They cost about $16.00
Or, go to a Public Library.
On all Dodge, Chrysler and Plymouth trucks and cars you will need to get a repair manual because you will need to pull the dash and discharge the a/c system..........
Its a very large and complicated...
This must be a vacuum hose, with a connection to the intake manifold, at rear of carb.This must be an after-market distributor because the original "Lean Burn" computer did not have a vacuum advance...