70 W31 Identification
Don't know a lot about Oldsmobiles so any help would be appreciated. If a Lansing built 1970 Cutlass S has a matching numbers QX code engine, is that substantial enough proof that the car is a W31 or could other Cutlass models be ordered with the QX code engine without being a W31? I know paperwork is the best proof but is not always available.
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