The other point is the air entry point is MUCH larger on the T34 versus the T3, some T34 had NO cast support as std.
It could also be a converted T3, compressor housing machined out to T34 size with escy trim wheel, as mine.
This is something you CAN have done to yours as well, so why not phone up the TURBOCENTRE and speak to Andy or Craig, about prices, as they start from £100.
Get a 360 bearing at the same time and it will last longer!
tabetha