Name that turbo

[1984 t-type]

I have been looking at pics of different turbos and trying to identify what I have with no luck so far. So I figured that I would ask my big brothers for some help. The inlet side on it has a 4" opening the innercooler opening is 2" has the numbers 322-88 stamped on it, the letter A, M3, G, and I think AB can't see it that good.

 

[84TXGN]

Without taking the turbo apart you cant really get the specific turbo. What size are the housings?

 

[1984 t-type]

I'm new to the turbo Buick scene how do I go a out measuring? What and were do I measure. Any pics will help