I've run 3.08 with close ratio TL and 3.31 with a custom wide ratio TL, and prefer the 3.31 diff / wide ratio setup; ran 295/50s for rear tires as described. 3.08s in either close/wide trans works, and it launches well for quick takeoffs with a torquey big-block for sure, BUT for mild bumbling when caught in traffic, the 3.31 diff / wide ratio trans is hard to beat - especially if you are running a performance cam and need just a tad deeper gear. Anything lower like 3.54 or 3.73 is just more tire spin. These light weight cars with more torque/horsepower motors these days love the taller gears for overall street driving IMO. Good luck.
