The 5.0 level does give more holding power in 2nd gear. However, with increased line pressure of a manual valve body, there is no need for it, the pressure does the job. The 5.0 lever will be slower releasing during the 2-3 shift and can contribute to shift overlap (binding). For a 727, especially with a manual valve body, I prefer the 3.8 or 4.2 lever.