78 was the first year of the Buick V6 turbo cars and they came in 2 and 4 barrel designs. If your car is a turbo powered car or an NA from 78 to 80 then you have several adjustments you can do to them. After 80 they have computer controls and have different adjustments. The electric chokes were put on them between 79 and 80 and adjust differently from the earlier design.
Pics and a year will help to know what your dealinbg with as far as the design so please post some.