If your question is if your car is a SS, what not post that as a topic? Changed the title of this topic.
Absolutely no relationship between deluxe belts and any drivetrain option.
You posted the #'s as 09d 67-12637 nor 10181 d body 742-z r-2 2lg 3sl 5y. Axle as pw1006g.
No possibility this car is a BB. Way too early.
Axle is so close, but it isn't original.
It could be a SS350. Where does the speed cable go thru the firewall? What's the VIN?