Which is why I was looking at the CR25H converter which is listed as being used behind '77-up LA 360s. Rock Auto was advertising them with an approx 2500 stall (when in stock) but they are also listed elsewhere as a 2100 rpm unit. I don't know which is correct or if it depends on the brand. I also do not know if a 1977 LA 360 requires the same amount of imbalance as a 1989 LA 360.