iv heard that 350rwkw is achievable with only bolt parts and still retaining stock internals and intake manifold.a good high mount (manifold,external gate etc), bigger injecters/fuel pump,aftermarket cams, computer ( with the right tune ),metal head gasket to drop the compresion ratio and the usuall beefing up of the drive train. but iv seen no dyno figures or expected 1/4 mile times