I'm a Ford guy, so I cant just look at an Olds engine and tell you exactly what it is. My friend has a 72 Cutlass. He says it has an original "rocket" engine but doesn't know the displacement. Is there an easy way to just look at the engine and know which it is? Or are all the Olds blocks the same? He wants an Edelbrock intake manifold for it. I just want to make sure he orders the right one.