I agree with Larry, if you still have a close ratio toploader, changing to a wide ratio gear set will make a major improvement in getting a heavy car off the line. Your current 4.11s with a CR 2.32 low gear gives you a starting line ratio of 9.53, leaving the 4.11s, and using a WR 2.78 low gear will give you a starting line ratio of 11.42. Even if you went to 4.88 gears, with the 2.32 low, your starting line ratio be a bit less than that (11.32). There really is no downside to using the wide ratio gearing on a street/strip car, or on the dragstrip. Maybe on a road race course, but you are not doing that, right? Back in the 80s, I had a 70 428CJ 4 speed Mach 1, with 4.30s and a Detroit Locker. With Goodyear 10x28" slicks, I could not get the car to leave as hard as I wanted to, plus I had to replace the clutch every other year. A buddy lent me a big spline (input and tail) crashbox Toploader that had been converted to wide ratio, out of his drag car. This was back before 60 foot times were recorded, but the differance in how the car left the line was huge. Unfortunately,on the first pass, the mainshaft broke on the 2-3 shift, so I never did get a full 1/4 mile pass with it, but between how much harder the car pulled off the line, and a Friday night "test cruise" made it apparent that the car was gonna pick up noticabely. In talking with a couple of other guys who had done the same thing, they figured .15 ET improvement was typical. If I still had that car, I would have loved to have tried my 3.19 low gear Jerico in it!