I paid about 59k for my 2015 stingray (1LT, Z51, M7, Magnetic Ride, Comp Seats, w/ blacked out wheels/mirrors/spoiler). That's about 9-10k in options. A tech package GT350 is very similar in price... and I expect it to be very similar in performance. I'd love to have one (that engine sounds great). I might look into trading for one in the distant future. That being said, I love being able to take the top off the vette... and I wouldn't be able to do that with the GT350.
I have to believe they will be somewhat similar in performance but the vette will probably win on the road course with 400-500lbs less weight and the additional torque.