I'm looking at 74. An 85amp L/N (Leece-Neville) or 86amp Motorola were available as well as a 65amp heavy duty w/batt isolation (presumably the grommet Craig mentioned above)in addition to the 50 and 60 amp alternators.
I have an engine harness from a 70 truck and the alternator wire is much larger than the car examples I have even though it has the same connector at the bulkhead disconect that cars use.