Look inside the turbine housing where the exhaust enters, the twin ports, the number is cast (inverted casting) inside there. It is in there, you have to get dirty to find it. Squirt some carb cleaner in there and wipe it out.
The turbo is still on. Can Iget the assembly # from the engine tag and figure out what it is? The engine is still in the breadvan it was repowered in 2002 an has only 36,000 on the engine since would it have a different turbo being that new. What year are most of these from frito?