Are you going to use their shifter assembly aswell? Are you using the domiwerks adaptor?
I have been reading into this conversion for something different from the th400 i have in it at the moment.
I have also put a 350 3.5 diff in my 32, with 34 subframe and GKTech offset bushes. I have also found a 2 bolt cover from the states i am waiting to arrive to see if i can use it