Actually, there is something to be said for selling it now. It is a rare and highly sought after car, but for how much longer?
I remember in the early '80s when the value of Model A's and restored early Ford V8's crashed. It was because these were the cars my parents' generatuion cherished and related to. As they started dying off and/or shedding 'stuff', the supply quickly exceeded the demand and prices plummeted. Still hasn't rebounded. Did you watch Barret Jackson lately. How many non-hot rodded '30s cars were featured? Any Fords?
A Hemi Mopar was a dream car for an awful lot of boomer boys. They are now in their '50s and can afford therir own Dukes or Bullit-mobile (yeah, I know the bad guys drove the charger, but stay with me here) These guys are ready to pay the big bucks right now, but 10 years from now, it will be 32 roadsters all over again.
My 26 yo daughter and friends probably wouldn't appreciate a hemi Charger. A fair number wouldn't even recognize it. They are hung up on the warmed over rice rockets of the '80s-'90s. Supras, Z cars, Preludes, CRXs, etc. These are the cars that will be the price leaders in 2020. That Charger won't be crushed, but it isn't going to command this sort of premium.
I would say if you are trying to combine an investment with a project, something to give you an excuse for garage time, I would look at good condition examples of the legendary cars of the '80s. They are cheap right now, and the good ones got better than average care. I'd say look for an NSX, Audi Quattro coupe, 928-S4, BMW 635, etc. These are the ones people will be looking for in ten years.
Me, I'm between projects, having just shed a 58 MG and a 71 Saab Sonett. My daily driver is a well cared for 1990 BMW 535.