I have a mate who had a 33 with 320rwkw on race fuel with stock internals (although tomei cams) as his daily. It ran reliably for 3 years or so until he sold it. It had done a few runs down the strip before he bought it, but otherwise he babied it. To be honest, if he had been hammering it on tracks etc i think it wouldnt have lasted. Needless to say, the thing was scary fast for the street