Stall and Shift RPM Question.

My 904 shifts from 1-2 at about 3000.
If I put a 3k stall converter in it, what will happen?
Would it want to shift immediately after launch?
I believe I need to raise my stall just a little bit.
Comp Cams (XE268) says this is the largest cam that can be used with factory stall.
In gear, it want's to creep pretty good.
On top of that, my 'teen doesn't start pulling hard until about 2500.
With the low factory stall (feels like about 1500-1800) I think it would do me some good to get higher stall.
What are your thoughts?