Depends on how badly the buyer wants it. I doubt your engine is smog legal in those states that perform smog checks. Maybe someone would buy it for a race truck or sand buggy. Ask LC what they think or do a Google search for other people selling similar engines.
hrm...here in Texas, the smog check for vehicles as old as mine (not sure what the cutoff is) is a simple "sniffer" test. I wouldn't be surprised if it passes - but, looks like toybox is in Texas too, so he'll probably know.
As for what your engine is worth...I dunno. Looks like you've got a nice setup though (from your sigline).