For me the sleeper would have to be a big bumper 4 door. IRS from Cobra as well as the engine and trans, preferably an auto so it could be controlled by a column shifter. The perfect candidate would be a car with decent original paint. Widened and properly offset steel wheels with dinged up hubcaps and a bench seat interior. No one would look at that car twice until it clicked off a mid 11 second pass.
I would have to go the sleeper route,4 door converted to 2 door, big V8 with bottle, corner carving, hidden rollcage, big brakes, stock looking interior with added comforts. I had thought AWD with a RWD option for the Minnesota Winters but that passed as I usually drive the Jeep in the winter. Also an all stock origional 4 door V8 color matched to above. I could fill a big shed with all the others I would build. 2 door and 4 door versions.
My 72 Grabber with the Rod & Custom Mustang II front suspension. And the 2011 412 (really 435) HP Coyote 5.0 and 6-Speed with 9" and 4.11s. My Pinto gets the 3.7 liter 305 HP V6 and 6-Speed out of the "regular" Stang. Oh and 4.11 gears...