Good info in here... this should be stickied.
I went from a 3.55 to a 3.08 in my old car and it was a bit too much I feel. I am going with a 3.27 on my new car. Should be just right.
DAILY DRIVEN: 92 GT
306,9,5:1,AFR 185s,RPMII,xe264hr,ProMagnum rockers,turbonetics 66S,bg kit,METH,Flowmaster catback,Accufab race 75mm,pro tube,60lb injectors,255lph walbro BAP,ac delete,no smog,full MSD ignition,mark fan,3G alt,TKO600,spec stage 3,alum flywheel,3.55s