OK. I guess it comes back to the fact that the ECL code for option H05 (373 rear axle) is known and the ECL for the 307 12 bolt posi with 4 wheel disc brakes is not known due to nobody having a car with the proper docs to discover it. And there are no known Chevrolet reports or documents that would lead to that discovery.
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67 RS/SS 396 Original Drivetrain
70 SS 396 Convertible Original Drivetrain
70 SS 454 LS5 Survivor Original Drivetrain
65 Impala 396/425
65 Triumph TR4 Original Family Owned
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