Bill,
If you post the body tag code, people here can help you.
If it has an engine, that code is pressed into the block in the ledge to the rear of where the distributor goes into the block.
If the three doors are good, and the fenders are good, and all the interior/exterior window trim is there, $500 might be good deal, just for those parts.
What is missing?
Are the two sets of rear seats with it?