Another interesting detail is the coil cover and more specifically the associated vehicle emission decal.
Owning several SVO's over the years I have managed to collect a few "spare" parts. Recently while working on my low mileage '86 example I was curious about finding a better looking decal. Not quite as easy as I first thought.
For the 1986 model year, the engineering number on the back of the plastic coil cover is E6ZB-14A088-AA. I have found three different emission decals used;
E6AE-9C485-AFM this appears to be used in the US with the exception of California
E6AE-9C485-AFN this is used in California
E6AE-9C485-AFP this is used in Canada
According the 1986 MPC, the part number for the coil cover is listed as E5SZ-14A088-A for '85 and up.
For the 1985 model year, the engineering number on the back of the plastic coil cover is E5ZB-14A088-AA. I only have one emission decal example;
E5AE-9C485-CGT
I have a coil cover with the engineering number on the back of E4ZB-14A088-AA, but unfortunately the decal is missing. I am assuming it is for the '84 model year.
Looking at the available options for the 2.3L TC SVO emission decal from Jim Osborne, I see the following;
1986 E6AE-9C485-AAP
1985 E5AE-9C485-CUM
1984 E4AE-9C485-ALV
Focusing on 1986, I am curious what the difference is between the letter designation AFM vs AAP.