Thanks Big Dave !!
Is the engine application pad on the lower right or left side of the motor as you stand in front of the car? Is there anyway to tell if its the standard L35 325 HP 396 as opposed to the Mark IV L78 which was rated at 420 HP?
Haggarty's lists the 8-cyl. 396cid/325hp 4bbl L35 "for 1966" and the 8-cyl. 396cid/425hp 4bbl L78 "for 1965" so maybe its the L35 engine?
History of the 1965-1970 Chevrolet Impala
New for the 1965 Impala lineup was another special package, this one created for the four-door hardtop. Called the Caprice Custom Sedan option, this deal included a stiffened frame, revised suspension, black accents front and rear, and special trim and wheelcovers. The Caprice nameplate adorned a complete new model line beginning in 1966.
Still available for all Chevys, the famed 409 V-8 appeared briefly for one last run before being superseded midyear by the division's new Mk IV big-block V-8, a 396-cid beast that made 425 horses in top form in 1965. Beneath Caprice hoods, the optional 396 was rated at 325 horsepower. Both the 396 and its 427-cube Mk IV running mate were available for the 1966 Impala SS. A specially packaged SS 427 Impala debuted in 1967 and carried on alone after the base Super Sport was discontinued in 1968. Chevy offered its last full-sized SS 427 in 1969. The original Impala run ended in 1985.