i've got 330mm discs on bells. i had to first make wider spacers between the caliper halves as the ap discs are thicker than standard venteds.

then i made a custom bracket to put the caliper further outboard from the hub carrier so that the pad area is centerd on the disc face.

then i modified the calipers to clear my 7 spoke wheels, but that may not be necessary on other 17" or bigger wheels.

am i right in thinking that you were at the last pf berkshire meet? being new there, i don't know everyone yet, and nobody introduced us and i'm a bit shy. if you come again, you can see them on my car. in the meantime, i might put it over the pit one day and get some photo's, if i do, i'll post them up for you.