It's from LKQ, they don't know shit other than what car the parts came off of.
Chances are that this engine was removed from a GSR that either had a blown engine or was bought as a shell and an A1 was put in there as a cheap replacement.
It's not uncommon to see a 96-01 valve cover on a 90-95 engine. Could also be a chance that the head is from a 96-01.