I have a 1979 Camaro RS. It has 2:41 rear end gears. I kept the original 305 motor but beefed it up with a mild cam, Vortec heads, 650 carburetor and dual exhaust. I swapped the T350 for a 700R4. Now I wan to change the rear end gears. I am deciding between the 3:08 and the 3:42's. I have the original rims (14") and tire height is 25". I like the power of the 3:42 gears but don't want to lose my ability to cruise on the highway at 80. Any ideas?