I think I am safe saying the current market for cars like this will not support a price anywhere near the listed price. If it was a low mileage, all original, everything numbers matching, never restored or modified, then maybe. There's a whole pile of work under the hood to make it original again.
Not that I don't like the car, it's over the top for cool factor, and has documentation, a big plus.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
$20-25,000 as is, assuming it doesn't need an engine or other major rebuild? I am not up on these cars much either, but a 427 car is rare in any GM and a 4 speed in a full size in these years is also rare.
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63 Parisienne sport coupe (The Big GTO), black, maroon interior, 409 4 speed; former owner of a 59 El Camino, 63 Corvette SWC, 62 Chev Bel Air SC. 1963- Pontiac top selling car in Canada
Mahone Bay, NS Still not old enough to need an automatic
FYI - I took a quick look at the car on Sunday. I checked the engine stamping, it's a 454 block that has an internally balanced 396 or 427 crank in it, which would make it 427 cubic inches. But it's not a 427 block.