is it integrated??? wether it is or not the decks obviously had its headtube bent, just try dending it back, wherever the headset bearing doesnt go in has been slightly dented and id suggest lightly hammering it, or getting a file and filing where its been pushed in.
or get a shitty headset bearing cup and a vice grip and sticking it in as far as it'll go and where it gont go in you get a hammer and smash it in, ive done it to one of my mgp's and it works too.