Commando engine in 64 Barracuda?

They were late 64's, why they are called 64 1/2. April 1 was the start. Making them a late production 64. Not an early 65 model year. The 64 1/2 have the 64 dash. So push button controls for the autos. 65 the push button was gone . The 1/2's had the pull style heater controls, 65's have the slide clever controls.