The 3.5 tb bolts onto the 3.0 upper intake machining to the intake hole needs to be done to match, I've wondered the effects of using the whole sohc upper intake and tb.
I've not done the homework on this but maybe if there is a lower intake that is ment for a multi length upper intake runners we could use the 3.5 dohc upper intake with it.

I have a whole 12v 3.0 sitting in the garage I'll have to find the maf for it but if you need a intake i can pull it i would like it back when your done with it if possible. I also have a 3.5 tb and the dohc multi length upper intake