Doesn't "process" indicate that the lens was intended for copy work at limited reduction. I think on an 8x10 camera it will be fine for any use. Do you make mostly contact prints? I have used a modern coated Wollensak Raptar 105mm surplus lens originally made for a copy machine mounted in an old Wollensak shutter (perfect fit) for 35 years on my 4x5 camera. I use for wideangle architectural photography. In my office we have 16" x 20" color enlargements made from transparencies that have amazing detail. Just because a lens was originally intended for a specific use doesn't mean that it will not work for other applications. Try it out.
Process lenses are generally very well corrected for all the lens ailments and will do a very good job used on general photography. Only drawback is the apertures run to the small side, and thats a minor item most cases.
The WA Process Nikkors are unbelievably sharp. They are expensive to put into shutters but are supposedly sharpest in the barrel. If you can live with F32 you are in business. I've tested the 240mm and recently(last week) bought the 260mm and 360mm versions which are about to go on my new Wisner 7x17 and 12x20. Try the one you have out and see for yourself. Good luck.
I just bought a 260mm f10 WA Process Nikkor (new, in a box) today on eBay. As Emile says, they have a reputation for being incredibly sharp. I can hardly wait to try it out on my 8x10. It is in a barrel mount.