Just the price. I didn't mean to imply anything else.
As Mckey suggested look up the NADA value. And as John61ct suggested an oil analysis is a must. Let Blackstone lab know your motor specs, mileage and the fact you are selling it. This way they can give you a detailed explanation of the results.
Make sure you are giving detailed pics inside and out including the undercarriage. I personally price my vehicles somewhere between high NADA and high Bluebook for a quick sell. Since you are in no rush to sell it I would price it extremely high due to current market conditions.
Whipple stopped making the "bolt on supercharger kits" for the Vortec 8100 a long time ago. The supercharger providing it's in good condition is worth over 5,000.00 alone. Not much to go wrong with one except the belts on a street unit.
So if it was me, considering the current market in my area, I would ask 12,000.00 for a quick sell or 15,000.00 and wait it out. Whatever price you decide don't let it go for any less than what you are willing to accept. I don't know you so do not be offended when I tell you sometimes sellers are impressed and the price weakens at the flash of cash. Don't let that be you. When I sell something I set a firm price and stick to it. I will not take a penny less. I make that very clear before the buyer shows up. That way it keeps the riff raff and dregs away.
I also sell in a neutral location such as a police station, court, or civic center parking lot. Better yet is meeting in a bank and conducting the sell inside. Expect the unexpected, be aware of your surroundings and keep yourself armed and ready just in case. If you don't have a CCW or do not have firearms training, then pepper spray/Kimber Pepper Blaster II or taser guns are pretty effective non lethal deterrence's and legal in most states.