brass toilet flange

I just took out a 3" brass toilet flange, about 1 1/2" deep. When the new tiled floor goes down the brass flange won't be deep enough to fit down on the 3" copper. My question is do they make a deeper brass flange, if not can you pack and pour a cast iron flange on the copper?

Figured it out!

I ended up cutting the 3" copper back and using a proflex CK-33 with a pvc street 90 and I'm all set. I actually got a lot of help from this site by looking at different threads.
Thanks,
Jerry