Factory Prepared Racer?

Does anyone know the factory changes to the few prepared racers? I understand it is sometimes hard to make out the differences at a glace. Some have said...1) hold-down straps on deck and hood, 2) rear sway bar links added, 3) engine mods, 4) frame lightening openings, 5) ???????????

There's a car near me that possibly could be one of the few rare factory cars. It appears to be a stock, early '71 with pull-style handles, smooth deck, dual-pod dash and early engine tub without spare recess. I would like to know more about these factory-prepared racers so I may determine if this is one of them.

Thanks in advance!