Look like a nice pair of unmolested 660s (linkages dont look modified). Good luck with the sale.
BTW, I had a set of 660s on my last boat and the motor loved them, once I got them set right the T/R would frost up in the summer. Some people say they have the precise air fuel mixing abilities of a brick with a hole in it. But on my last trip I made a few hard passes and cruised around a bit and still ended up pumping 14 + gallons out of the boat after I got home (2-10 gallon tanks). Good carbs once there dialed in.
