I gotta agree here , think about buying a decently equipped gen 3 5.0 and slapping a whipple on it. Then just go to aftermarket for some 5 link rear goodness w/ beefed up driveline. and some external bypass, perhaps some mild lift and geometry/ strengthening the cv shafts up front… def will be way less than the rap R. Anything turn key is going to be way more expensive.