Full automatic race valve body??

In my sleeper project I'm going to keep with the column shift. What I don't want to happen with the 727 is the thing shifting out too soon and not getting into the power band. Seeing that this is my first Mopar build, and I'm familiar with Fords, what are my options to not shift this trans via the column shifter, to see if it will hold the shifts out high enough by itself?