One of the reasons those ratios are so scarce is that a bunch of us 1/4 mile dirt trackers scavenged up every 4.11 we could find back in the late 1970's. We would run a 4.56 on some tracks, and the 4.11 on slightly longer ones, both running against a 1.88 ratio 2nd. gear in a Muncie 4 speed. The difference was the way the "1/4 mile" was measured. On the tracks that were measured around the outside wall, we needed the 4.56, but if the distance was measured around the infield the 4.11 kept the engine from running out of breath down the straightaway. The idea was to leave the turns at about 3,000-3,200 RPM, and hit 7K before chopping the throttle to make the next turn.
Jerry
