Nice! Yeah, no reason to replace it, unless you desire more power, or finally decide to ditch the external regulator. I might be tempted to do that if it ever goes bad, the the alternator itself is one of the best of the early models.
They ranged from 70a to 105a from the factory, but since it's a Lincoln, it's probably the higher rated one.
One thing I would do though, is maybe verify the output by looking for a stamping or part number on the side of the case.
In lieu of that though, just make sure you wired it directly to the battery just like you would with a 3G or similar alternator. Because it's at least, if not over 70a output, you don't want to over-tax the original alternator/ammeter wire.
Do you remember how you wired yours? Did you add your own wires, or simply attach the old Black w/yellow stripe charge wire to the BAT terminal on the side of the alternator?
Paul