What would it be worth?

I'd agree it's probably easier to part out assuming you haven't done much modification specifically for the Hemi (not that there's typically much to do). Selling a roller as a blank canvas for the next guy to put his thoughts into and a separate drivetrain would probably be the easier sell. Resto mods have always been a weird market. Some people pay crazy money for them, but usually because it was a big name shop that built them. To the average Joe it's just another car with a different engine. I think I could probably get parts value out of my car if I sold it, but I also built it pretty cheaply and didn't get real fancy since it was always going to be a driver as opposed to a show car.