Buy a 98-02 fbody roller, do a 12 bolt rear with 4.10s, stalled/built auto and drop in a heads/cam LS3.
Should get you close.

Or get an AWD DSM. Built 6 bolt, big turbo, shep trans and a lot of weight reduction.

Or turbo w-body with a built trans and a ton of weight reduction... in any case, buy slicks.