You can try these resources:
* Your Chevelle's owner's manual: This is the most reliable source. The GVWR will be clearly stated.
* Online resources: Websites specializing in classic car information may have specifications for different Chevelle years and models. Search for "[Chevelle year] [model] specifications."
* Chevelle parts websites: These websites often have detailed specifications for the vehicles they sell parts for.
Without knowing the specific year and model of your Chevelle, I cannot provide a GVWR.