The Stovebolt Site Forums The Shop Area Driveline to keep torque tube or drop it ?

i have a 52 A.D. 1/2 with its original drive line.I know that I won't be able to drive it a 60mph on the highway for very long.Is there any way to swap out the gears for a different ratio that will allow this or should I swap it out for something newer.She has a 216 with 3 on the tree running 16" tires any input would be helpful!