The Mk.II was rebuilt by Holman Moody in California to handle the 7.0-liter FE (427 ci) engine from the Ford Galaxie, used in NASCAR at the time and modified for road course use.
The car's chassis was similar to the British-built Mk.I chassis, but it and other parts of the car had to be redesigned and modified by Holman Moody to accommodate the larger and heavier 427 engine.
A new Kar Kraft-built four-speed gearbox replaced the ZF five-speed used in the Mk.I. This car is sometimes called the Ford Mk.II.