3.23 or 3.55 Behind a 318

Im in the process of putting in 3.55's but i running 18's with 25" tall tire and a TKO 600 5 speed, Im not sure I made the right choice the gears are
2.87 1.89 1.28 1.00 0.64 reverse 2.56
curios how it will act.

One other thing to consider and why i went with a OD is here in SD most of the interstates are 80 MPH