Today’s quick look under the hood features the 1968 AMC AMX powered by the legendary 390 cubic-inch V8. Rated at 315 horsepower and 425 lb-ft of torque, this powerhouse gave the lightweight AMX Corvette-level performance in its day. The 390 was entirely AMC-built — not borrowed from the Big Three — and featured a high-compression design, forged internals, and a four-barrel carburetor for pure muscle-car punch. Its factory-correct AMC Engine Blue and “390 cubic inches” air cleaner decal made this