Something doesnt look right about the exhaust housing for a T3....... yours looks bigger, the water pipe fits in a different place, and the wastegate to elbow bolts are a different config!!
My guess would be (and it is only a guess having never seen a T34) is that it's a T34 exhaust housing with a cossie (T3)compressor wheel....... although why anybody would do that i dont know..... so probably not now that i think about it some more! lol

My old T3...