904 race build

So I was playing around with a four clutch drum and put in five blue raybestos frictions but only got .040 clearance.The blue frictions are .064 thick.I would think I need another. 020 clearance from what I've been reading. Can the pressure plate be milled down or are there other options?
I assume you are talking about the ati sprag.Been kicking that idea around for sure.
That's good info on the vb.
Yes the ati sprag but a&a sells it too. Do you also have the thin steels in that drum? If not that would give you some additional clearance.