Yes, with a Tremec i would have no hesitation for a 4.10 gear in back.
3700/600=6.17lb/hp
3100/505=6.14lb/hp
Lower is better.
Very close for sure. Depending on model year and options, a Z06 isn't going to be 3200lbs, more like 31xx or 3xxx.
My 2008 base model vette(steel frame) with drag pack and passenger seat removed was 3029lbs and went 10.67@129 all motor. Weight matters. lol