What am I missing here?
Where in the world are you finding wrecked Hellcat Charger's for $11k? Not calling you a fibber, but I don't buy it. Plus, you said you have $10k to spend, and I know the link you provided isn't what you're looking to buy, but should give you some insight. That motor is $26k. You're $10k won't go very far. As others have said, it's doable, but a mountain of work that I think is going to involve a lot more time and money than you expect.
*Traded* 2010 Charger R/T AWD. Brilliant Black Crystal Pearl exterior, black leather interior, front chin spoiler, Flowmaster Original 40's, tinted windows.
*Current* 2013 Charger SRT8 Super Bee. Black. Flowmaster Super 40's, and 20% tint all around.