I installed a 79 nova. the ratio is not the best but it was cheap and easy to install. how easy you say, i did it myself. that is easy. it has a 2.73 bu i would guess there are others. i have put more that 12,000 miles on it. two trips from indiana to Kansas City mo. and back. no big mountains. but i do have a t-5 with overdrive and averaged 20mpg.