You are right, Some of the nascar engines use long rods, but get real, they run 8000-9000 RPM and run one race. In a street engine the difference is so neglible you will never notice it. Longer rods weigh more, cause short piston ring stacks and higher wrist pin placement, this is not really that good for long term reliability in a street engine. Spend money elsewhere, like cylinder heads and valve train. it will be money well spent.