Hmm, I just checked the bellows on mine and it seems like I should be able to get at least another 1/4" total and maybe more. Any extra width I get is just a boon anyway, so if I can get anymore I'll be happy.
The 135 Optar works quite nicely on the camera and gives me extra coverage to utilize the rise/fall and shifts on the front standard. The ground glass (which I'll mask out to only show the are where there is 120 film) will be a definite boon for using the movements.
I already have the 90mm angulon and it's not a permanent affixment to the camera so I figure it won't be too much to move it back and forth b/w the 3x4 and the 3A if need be.