95 G20 van trans. question

Hi. I just bought this van from a friend at work, he was replacing the injectors, and broke the injector bowl. I was trying to find a throttle body for this van, but they tell me it had 3 different transmissons for the 5.7 engine this year, and 2 trans. have the same TBI, the other trans has 8 different possibilities for a throttle body. How do i find out what I need? where is the trans. id number stamped at on this trans? On the top is only a sticker that says 5CHD, and lots of other smaller printed numbers. I looked all over for a stamped, but got tired of wiping gunk away, so a location would be nice. and if anyone has a throttle body, or injector bowl laying around, contact me!

A GM dealer or a salvage yard can run your vin no. and tell what you have.
Also salvage yards have interchange books.