and my Z runs rich as hell still......my egt get up around 800-850 under full throttle prolonged pulls. and ive heard its about 100 degree difference between the gasses directly going out of the cyl. compaired to the gasses going out of the turbo....my A/f ratio was past 10/1 on the dyno a few weeks ago and temp was at 850.
hope that helps a little....i know your making allot more power than i am, but the temps with the a/f ratios should be similair.