Engine specs pending, but here is a quick Google search spec detail:
The 1965 Mercury Montclair was a mid-level full-size car featuring a standard 250–266 hp 390 cubic-inch V8 engine, available as a 4-door pillared sedan or a 2/4-door "Marauder" fastback/hardtop. It featured a 123-inch wheelbase, with options for higher-output 390 V8 engines, 4-speed manual transmissions, and the distinctive "Breezeway" reverse-slant rear window.
Engine and Performance
  • Standard Engine: 390 cubic inch (6.4L) V8 (FE-Series) with a 2-barrel carburetor.
  • Horsepower: 250 hp (manual) or 266 hp (automatic).
  • Optional Engines: Various Marauder V8s with 300, 330, or 425 hp ratings.
  • Transmission: 3-speed manual (all-synchronized) or 3-speed Multi-Drive Merc-O-Matic automatic.
  • Torque: Approximately 378 lb-ft (
    512 Nm512 Nm
    512 Nm
    ) for the base 390.
Body Styles and Features
  • Models: 4-door sedan, 4-door hardtop, and 2-door hardtop.
  • Breezeway Option: A distinct "Breezeway" notchback roofline with a power-operated, reverse-slant rear window was available.
  • Suspension: Independent front suspension with coil springs and a live rear axle with leaf springs.
  • Exterior Features: Dual headlights, full-length body side moldings, and deluxe wheel covers.
  • Interior Features: Deep-loop carpeting, "Biscuit-design" Lamay fabric/vinyl or all-vinyl upholstery, and electric clock.
Dimensions
  • Wheelbase: 123 inches.
  • Length: Roughly 218 inches (approximate full-size spec).
This car has been in storage for years!