Since Pete doesn't live too far, we could have a meeting of the Manhattan 5x7" Graflex Society, and you could compare models.
When I've bought Graflex holders at Lens and Repro, they said that there's a portrait photographer in the city who does a lot of work with these cameras and usually buys them up. I don't know who it is.
The standard lens on the Press Graflex is the B&L 5x8" f:4.5 Tessar, which is around 240mm . Other lenses I use on it are a 210/3.5 Xenar, which doesn't quite focus to infinity, so I think of it as my "indoor lens", and a 12"/6.8 Gold Dot Dagor in barrel. I think the longest lens usable with this camera would be about 14" or maybe 16" or a 360mm tele. Lensboards are 4x4", so it can't take huge lenses.