About 7 years ago I bought a 325 that was mounted on a W6 for $500 from a neighbor.
As a part of the deal I had to remove the loader and front mounted pump from the W6, which was not running.
I pulled it into my shop removed the loader, rewired the switch and primary wiring & put new points and condenser so the W6 would drive out of my shop and drive home.
I then had to shorten the pedestal the valves was mounted on and fabricate new axle mounts for the loader to fit on a 450. Along with that I had to put some new hoses on the loader and repack the lift cylinders.
Based on what I had in that one I think Allan and Gary are correct, it is in good working order (so that the buyer doesn’t have to start replacing hoses and rebuilding cylinders) and the PTO pump is included then it should be worth $750 - $800 to someone that has a use for it.