1970 Duster Starter Wire Wiring - Does it Matter?

That is hard to answer not knowing what all you do / don't have now. Originally, that big stud either went to the battery and from there to the starter, or the other way around. The main power for the passenger compartment came off that stud, through the fuse link, through the bulkhead connector and to the ammeter circuit. No idea at this point what might have been modified.