You should have a normal 318 2-bbl car that has had a 4-bbl installed to it (no problem – just establishing a base line). Should also come with an A999 transmission and 7¼” differential. Rear differential gear ratio is most likely to be a 2.4:1, but might have a 2.2 or 2.7:1.
These pictures were taken from my ’86 5th Ave 318 2-bbl with Lean Burn and linkage is all correct. Pictures indicate what is different between the 2 and 4-bbl setup.
The throttle cable is longer on 4-bbl car by about an inch.
I would get the correct cable before driving the car because you can get your existing cable in a bind and it WILL hold your throttle open (and will make for a BAD DAY, real quick).
Most parts stores should be able to get you a 4 bbl cable (they are still available).
There should be a Holley Chrysler adapter added onto the carburetor.
If not - get one or you will not be able to get throttle open fully NOR get the transmission linkage to work correctly, without it.
The adapter moves the throttle stud towards the L/F wheel by about 2 inches, roughly. The throttle cable and transmission hook up is also moved over and sits on top of the valve cover now.
The throttle stud should be roughly at 11:30 O Clock position when closed and WOT (Wide Open Throttle) will be at a 2:30 O Clock position, if everything is correct.
The cruise cable should be tight enough to allow a little play in the link pin (see picture on post above).
The throttle cable should be slightly loose on throttle stud.
If needed I can get the correct cable adjustment procedures, if needed.
The transmission kickdown linkage is the big issue. A person can modify the throttle cable stand to move cables outwards (or make a bracket that extends it out the same distance as the Holley adaptor is).
4-bbl linkage is not easy to find and it may be easier to purchase a Lokar cable to replace your linkage with.
Throttle closed
Throttle open
Note: These items need to be moved over about 2 inches (2-bbl shown)
Cruise cable routing. Notice the bracket on brake master cylinder that cable goes through (under booster vacuum hose)
BudW