what's this a body worth

I'd say 3500 as well.
Since it does not have the original engine, I would think $2500-3500 range. You say it is pretty solid
except for lower 1/4's and the interior is decent. For a project probably a pretty good deal. Missing
the original engine would not make it worth as much from a collectors stand point. I myself think
"matching numbers", etc. is over rated.