383/727 Value

Not sure how much this will help you but it's tough out there right now. I've had a 440 hp core with fully forged internals for sale for a while now at what I thought was a giveaway price and I opened it up so that the whole thing could be inspected and all I have gotten is people offering scrap metal prices.
If you take it apart for pictures and then put it back together I guess it will only help your listing have a little more luck.
Not sure how much you paid for the 383/727 but maybe use that as your starting point for pricing to just break even. Maybe add $50-100 on top so that people can negotiate you down to that point. If it doesn't sell in a month or two then open it up, take the pictures, and close it back up again like you suggested here.