It has a full perimeter frame.
You need to call a wrecking yard that has a Hollander cross reference and they can tell you.
At the rear of the engine on the passenger side is the filler tube and dipstick,
Look in the fuse box, it's the round silver thing that plugs in.
To replace the drivers side mirror on a 1966 Impala, remove the screws with a Philips head screwdriver. Remove the mirror , there will 2 5/16" bolts retaining the baseplate.
There were a number of cars used in the movie called The Outsiders. There was a 1951 Chevrolet 3100, a 1957 Chevrolet Bel Air, a 1958 Chevrolet Bel Air, a 1963 and a 1966 Chevrolet Impala, and a 1963 Buick Riviera.
Remove the crankcase breather cap up in front of the engine and add motor oil down the tube.
You need to purchase a Haynes Manual that covers your car. You can buy them at a bookstore or an auto parts house.
66 Impala bolt pattern is 5X4 3/4
On the verticle part of the mirriw is a Phillips screw. Remove the screw and carefully remove the mirrow. there is 2 5/16 bolts that hold the baseplate.