I would go with the W8 or W9 build before the Gen III Hemi stuff for sure. A 420"+ motor with alot of r and d. Getting the car light will be the trick. I got alot of whats needed to build one. Need to contact a few chassis shops today. I will just buy a new 2011 SE Challenger. They have 0%. Cant beat that.

2010 Toxic Orange Challenger built by B and B Racecars! All aluminum R4/P5 engine, Proformance TH400 (3 speed) tranny, full Reid case, nodular 9" rearend, full Dragpak suspension, Protorque custom converter, BS3, PTE 85mm turbo, fire core wires, carbon doors, carbon front clip, and a whole lot more!