The 1966 GTO only came with the 389 cid motor. You could, however, get it with the standard 4 bbl quadrajet Rochester carb or the optional tripower (3x2 carbs).
Yes. A gto is pretty much the same chassis as a chevelle, which was available with a 396, which is the same size and weight as a 454.
Sae 10w40.
389 cubic-inch. 360 horsepower
Yes.
yes it will
Images for 1966 GTO are available on the Ultimate GTO website. Ultimate GTO has a tool which allows you to search for certain pictures, narrowing down the color and other details.
Oldsmobile V8/1962 TO 1977
No
206.4 inches.
The standard tire size for a '66 GTO is 7.75x14.
the 4 bbl. version was 335 horse and the tri power version was 360 horse.
Condition and originality are key. No way we could give you a fair evaluation here.