I say a 424 ci stroked Olds 350. If you build one like Cutlassefi's first one, you can have 400 hp and 500 ft/lbs of torque, it was 9 to 1 compression with a mild roller cam, you could still run the CCC. If you could find a set of the rare 69 5A 350 heads or add "A" to set of 5 heads would really fool people. Of course that still leaves the 2004R and mighty 7.5" rear end.