Darin, are you thinking of the 2x3 (Model C) or 4x5 (Model D) Pressman? I ask because the 4x5er has a 3" square board and according to Schneider the rear cell of a 270/5.5 Tele-Arton's OD is 51 mm. There should be plenty of room.
If the rear element of the tele-arton is 51mm, it should be fine. It is not the size of the lensboard of the pressman D that is the problem, but the throat of the front standard where the rear element must fit inside.
From my notes, the maxium lens diameter that will fit is about 57mm.
Go not to the elves for counsel, for they will say both yes and no.