What no one has mentioned is the dealers. Dealers loved to put 427's in 396 camaros back during these years. Yenko and other dealers like them just might have made an SS version of these trucks with chevelle emblems like stated before. You can bet that if someone bought a modified one off a dealers floor they would think it was stock. 454's came out in 70 so I would not dought that some of the dealers did this.
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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS
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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS
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