JMVHO,, Unless you want to shift to 5th ... stay with the 3.31,, The lower 1st/2nd tranny gear will get you moving and the 3.331's will keep you in 4th in the 1/4,
You should get you into the mid-10's and 135mph on a 28" tire.
If you do change gear, 3.90's would probably be your best choice,, those will give you enough time to wind 5th out.
2010 Grabber Blue Mustang GT, Forged 4.6L Roush TVS and other stuff ... The modding shall never end ...
Wife's car ... 2014 Sterling Gray Premium GT 401A, stock for now ..