I thought so but not for sure. Someone swapped the motor some time ago. Date code is correct for the car. I've read about the 5 blade flex fan and I thought it was standard with the HO option. I read something about it in my PHS docs but do not have them with me to quote.

It has the SS blades that I am going to polish out after getting it powder coated.

Here is where Classic is showing a reproduction. http://www.classicindustries.com/firebird/parts/f91346.html