It should be the same as a 1970. On mine a
'70, it came from the factory like this:
There are 2 holes in the alternator bracket. One is larger and a bolt with a slip washer holds the NEGATIVE BATTERY CABLE TO IT. The other littler hole provids a place for the wiring harness clip that supports the alternator feed wires. The clip holds the wires so they are actually on the underside of the bracket, unlike the NEGATIVE batt. wire which is right on top.
Hope that helps.
-auto radio repair tech
-building team chevelle's radio info pages
Long live non-computerized fuel and fire!