BlackOpsF150

Hey everyone, I need opinions from anyone who's changed their rear end gears and raced with them. I have a 98 4.6 f150 with a tuner, exhaust, electric fans, and cold air intake. Underdrives are in the future as well as a pi head swap. What do yall think would be a good gear ratio for mostly racing with little street use. I have 20 inch wheels with some low profiles about two inches thick. Im looking at 4:10s but what do yall think would help my ET the most? Also does anyone have any idea what my truck should run now? Thanks for any help!

Fullpower

F150 has a tall overdrive; I'd go with 4.56 gears and no deeper, considering your 'some street use'.