looking over Comps footnotes, they do list the XE 268 as the largest cam with stock converter. the next step up is stated to need 2200 + stall. Im @ 2400-2500 on stall, & have a good idle in gear with my 383. I also run 4.10 gears, so the verter probably doesnt flash as high as a taller geared truck. As you get into a smaller cube eng, the cam will also be effectivly "wilder". i guess if my verter is too loose.......I have to go with a bigger cam!