Those cars are so good looking from the factory, I would build it stock appearing, like a restoration, but do a 572 Hemi, 10.5:1, eddy heads, or Stage V heads, solid roller @ 280ish duration at .050, .650-.700 lift. 2 AFB's on a Vanke intake, or step up to a Stage V dual quad intake. Put some nice shiny 15" wheels on it, like magnum 500's or Keystone classics. Get a set of slicks for the strip, or use some DOT stickys all the time. Dana 60 with aftermarket axles and detroit locker. Set up your rear leafs like the original Hemi cars, and add some clamps and extra half leafs like we do in F.A.S.T. It should go about 10 flat, be nice and streetable, and sound wicked.