3:55 gears to 323 gears

...and how did the performance change.I am thinking of using 2.94 in place of my existing 3.23
...stock 340 and 14" tires.

I got 2.94 gears and 26" tires, with a 380hp/360 crate engine have to drive in 2nd in town or it lugs. It goes ok from a light but be better when I go 3.91-4.30 haven't decided how deep yet.