I don't think for a second this oil will hurt your engine. Remeber, the 3400 V-6 is a DIRECT decendant of the 2.8 V-6, which came out in 1979. Engines like this ran for thousands of miles on SF oils.
The thing that bugs me about this is that at this point, that oil is a collectors item. You could sell it to a collector, or keep it as a 'historic example'.
By using, it, you just throw it away. But, if you ARE doing this, I would defintly want to see a VOA or UOA.