Assuming he is reg and will play "standard" post.

Should you 3b really bad AAxx? Bad KKxx? T976ss? 

I tend to say yes to all 3 hands simply because his range is going to be so weak and disconnected that you can show a profit with these hands (and flatting and being in the middle if the bb comes along is not a great scenario). Even if they are break-even 3bs shouldn't the fact that you have a wider 3b range make you more money with the stronger potions of your range?

Any thoughts would be appreciated