Also look for welded on rear sway bar brackets on the rear frame rails. It being a original automatic body rules out L78. At the present time there have not been any automatic 70 L78 camaros proven made. As you mentioned. Parts are easily swapped. I would go for a build sheet. if the tank was never removed. It should be there.
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1970 L78 camaro Cortez silver ralley sport under restoration
1970 L78 camaro cranberry red standard black interior original drivetrain.
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