Honestly, I don't think the 906 heads will let it! IIRC the cam is good to 6800rpm. I built the bottom end bulletproof and was told by the machinist it is balanced to 9000rpm.
ya I ran my 906 big valve heads for quite a while. If I remember right they fell off at 6800.. Switched to some ported stage VI heads and then she would wind up! LOL