It appears to have 13 blades which is incorrect for a first generation Camaro. With few exceptions (see below), just about every Chevrolet built in the 60's used the same 11 blade fan. However, if you look in the AIM on UPC 6 sheet A3 or A4, (And UPC K76 Sheet A1), you'll see what looks like YOUR fan!! 13 (?) blades and one groove on each blade!
What's the numbers stamped on your alternator?