you need the measure the back side, where it mounts to the intake manifold. if that's 65mm, then it's a turbo A TB. other than that there isn't much distingushing it from a '89+ TB. the entire casting is larger, so it's easy to mistake it for a normal '89+ TB.
EDIT: just looked @ your pix again. that's a <'88 TB (note the adjusting screw), i'm guessing just a stocker. measure the back side to be sure.
here's a turbo A TB (right) vs. a stock '89+ TB:
front- note how the difference is hard to see. note that the entire casting is larger, it's not just a bored out stock TB.
back- note how the butterfly + opening are larger, the difference is more obvious here. again notice the difference in casting.