This question seems to appear every 30 to 60 days...check the archives for lots of talk and facts on the subject. Lots of opinions and as the saying goes, like a butt, everyone has one. Anyway, I did switch to 3.55's (same as 3.54's) and like them a bunch. Quicker seat of the pants feeling, probably not much difference in quarter mile...never had mine to the drags, but others have indicated that the stop watch difference is minor. Oh, by the way, with the 3.07's, you can't pull the top rpm's...need way more torque than available. Top speed is pulled in fifth gear and should be (if everything is going well) around 180 + or -. Not sure if you can pull top rpm's with the 3.55's, I don't have the nerve/guts/stupidity to try it.
