I have an 86 ss Monte with a factory 350. It was special ordered. Can you tell me how many came out of the factory with a 350 in it?

You would need to contact GM's historical services department. They could tell you this. I would be willing to bet it's not too many, as the 305 was standard in these cars.

See the "G"in the 10th digit of the vin? That means it is a 305, not a 350. It may have been ordered as a 350, but the 305 was in it and eventually taken out.