74 to 65 Drivetrain Swap!

For the magnum manifolds you wont need to grind. For the early manifolds that dump to the rear look at the port on the head. The rear port there is a raised part below the port which is drilled and tapped on vehicles with air injection into the exhaust. On the early 360 like my 74 is is cast but not drilled. Grind some off that raised cast and some from the manifold to clear and do it out of the car because I found out after it was in the car. Do not take it all from the head or manifold take off from both trust me spraying coolant from the head while grinding is not pretty.