[Mr70]

It is worth what someone is willing to pay for it.
So much has to be considered like:
How complete is it.
Short block,Long block.
Is it ready to fire.
Does it have to be gone through.
Has it been bored.
Are all the components still attached,carb,Ex. manifolds,Intake,Alternator,Water pump,etc.All these parts are very sought after as well.

And is there a VIN# stamped in the pad behind the Alternator on the Deck pad.
If so,you should seek that Chevelle out,as that owner would probably love to reunite the Engine with his Chevelle today.This is being done more and more lately.And yes he would probably pay top dollar for it over others.