School me on a-body steering columns please

Generally "A" body column assemblies can be grouped as '60-'61, '62-'66, '67-'69, and '70-'76. Within these groupings column assemblies are typically interchangeable as whole units. This is not to say they are exactly identical in every way within a particular group. For example in the last group, to which your '70 belongs, there can be differences in the harness plugs. Also as you suggest, the '70 column has a neutral safety (mechanical linkage) to prevent starting without clutch depressed. But again they are mostly interchangeable as whole units as far as bolting into car and attaching to the steering box, minor wiring differences aside.