Velkommen til APUG, Kim.
With any kind of large format camera there is a seemingly infinite number of different lenses that can be used, since the only kind of incompatibility is if the lens is physically larger than your lens board.
For portraits I suggest you look for something around 210mm focal length. By the "divide by 3" rule this is a little shorter than you might think you want, but at portrait distances the needed bellows extension will make this behave more like a 240mm giving you just about the angle of view you were after.
There are literally hundreds of good 210mm lenses you can use. Anything post WWII will be coated, and give good results. Multicoating isn't that necessary with LF lenses, since they have far fewer surfaces than a modern zoom kit lens! So size is the only limitation - and I think even an old f:4,5 Xenar in the #3 Compound shutter will fit on your lens board. A newer f:6.1 Schneider Xenar is a great lens, the (so far) only modern one in my list of favourite lenses!