In that this a true L78 engine, the block alone is worth $1,200-1,500. The 7115 crank should fetch $1,500-$2,000 and the heads are a minimum of $1,000 all in their current state. You know how much you have invested so a package deal of $2,500 may be sufficient for you to use toward a new engine. If you’re not in a hurry, you could hot tank everything and create an e-bay ad with pictures to gauge interest. To the right buyer (who’s redoing a 1970 Camaro or Chevelle and wants the correct engine), you could realize $5,000 or more as its all original and not a pieced together engine. As I’m sure you’re aware, e-bay is an “as-is” deal and buyer pays shipping.

Regards,
Glenn