I didn't think about the catalytic converter altering the underbodies and possibly the frame in that area. If that's the case it would be '75 and up that would be different as the converters began is US cars at the beginning of the '75 model year. Since the trunks pans changed quite a bit in '74 and after, that makes me wonder if that's when they altered this forward portion of the frame. I just found a salvage yard seller that specializes in Camaros/Firebirds that said the forward section of the integrated frame is the same from '74-'81.
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'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
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