O2 numbers?

I just test drove my Barracuda again with a working wideband. Up to temperature I consistently saw 11's and 12's. Not much above or below that regardless of RPM or load. I don't think the secondary's ever kicked in. The motor is a newly rebuilt 273 4V-904. I am wondering what numbers I should be shooting for up to temperature and 2600 to 3000 rpm.
Thanks-----------DR----------------:-)