Nearly any lens in barrel from 150 to 200mm will do. You can go longer than 200mm but you'll lose infinity focus. If you're shooting close portraits, then it's a good idea, otherwise perhaps not.
There are a lot of older classic lenses to think about. I just sold a Heliar fitted to a 3x4 Super D lensboard -- that's one idea. Another is an older uncoated 7-inch Dagor -- they're easy to come by and affordable. Same goes for rapid rectilinear lenses, they are plentiful and inexpensive in this size.
Sanders