I would go no lower than 4.10 (numerically) maybe even 4.30, if people want to go fast then thats a good way, of course blower cars need to stay around 3.73, but n/a should run steep, my friend runs 150-175 shot with 4.10's and has just enough gear to hit the shift light at the top,

i love seeing the shift light flash split second after these mustangs come off the line, gotta shift fast, but thats part of going fast.
Basically im saying people that only do minimal higway driving are wasting their time with stock or 3.55, just my opinion.