You have to decide, but that's a fair price for the rig. The F-7 is a solid, relatively light weight boat, and that one doesn't look like it would require much effort to make it presentable.
Dunno about registration issues in NY.
Transom replacement is not hard, just tedious; the old motor will run forever--but change the impeller anyway; mix 16-1 or 24-1 (I've seen both recommended); Check the wheel bearings and re-pack them, no matter what the seller says.
Have fun, be safe.