T170 help

[Dyingbreed]

I picked up 2 rts t-170 trans I can’t remember which two I have at the moment but I’m running 3.54 gears and 265/75/r15’s (30.6) going by the calculator i would be running 2500rpm at 65mph in 1:1. I am currently only running it up to 50mph at 1900rpm. Which of the 3 overdrive ratios would you recommend 26.7%, 41.1%, 37.9% I’m just worried to pick the highest overdrive if it is going to be bogging with the higher 3.54 gear. My goal is to not be screaming at 60-65 running an 8ba in 37coupe currently have the 60hp trans