There will be no avoiding removing the panels from the covering if you want to sell them for top dollar.
As mentioned, these are just ordinary Ford replacement parts. The red-oxide primed pieces are generally more valuable than the black e-coat parts as the tooling was wearing out when the e-coat ones were stamped (i.e edges not as crisp).
Also, while the parts book may state correct for 65-66, there may be differences compared to original assembly line parts. Those differences usually only become important when a car is being restored to concours level. For 95% of the other cars, these parts will be fine and fit much better than most reproductions of the same. Although, do not expect them to fit as good as assembly line parts without at least some adjustments/tweaking.
As far as value goes, NOS red oxide front fenders can go from $300-800 each, red oxide coupe rear quarters, $300-600 each