408 stroker header size

I have a 408 with w2 heads that dynoed at 547hp and 562ftlbs torque, i went with the step headers. These dyno numbers were with these headers. It is my opinion that on a street strip car go with the smaller, race only go larger. On my four speed Dart with manual steering it was fairly tight fit as it was. Dyno results have shown exhaust header size changes don't have as much effect as changes made to the intake side. I faced this same choice while building my engine, Im glad I went with the stepped.