Older chassis parts overall aren't in high demand.
What you can get will depend on the exact condition of each part and how clean you can make them as well as how good you present them, selling format, current demand for each specific part, and how many of each part is already available and at what cost.
Also factor in your personal policies, shipping preferences, ect and the simple answer is there is no specific amount you can get so.... do your research.
One guy might sell 500 in chassis parts.
but another guy might get 1200 for the same parts.