I agree that with work any combo can be dealdy consistent. Just takes hard work and persaverance.

To the posters question in my mind a BB would be the best choice. The reason being it will be a much more mild engine build. I also think you can build a 650ish HP BB for less money than a SB of similar power levels.

But either can be made consistent. Being a consistent money winning bracket racer is about the total package not just the power plant. Every part of the car needs to be built, tweaked with an eye toward repeatability.