Yeah there's no need for a wideband unless you've done serious mods to heads, cams and intake or have a power adder. Other than that, I would just get it dyno'd with a wideband in place just to check it. No need to go drop $450 for the unit and install labor.
"Posterity! You will never know how much it cost the present Generation to preserve your Freedom! I hope you will make good use of it. If you do not, I shall repent in Heaven, that I ever took half the Pains to preserve it."