You are just not understanding the engine dynamics of how rod length affects the characteristics of an engine. Longer rods slow down piston velocity at many spots thru its travel up and down in the cylinders, thus reducing the torque, especially at lower RPM where it is more noticable. Many sources and books have been written on the subject, so its easily proven and verified and many dyno and track tests have backed up these findings. Longer rods are often used in racing engines for other benefits where the lose of low end torque isn't needed, such as high RPM operation.
You might need to contact Carillo for pricing, I don't think Scat and Eagle do custom rods. Along with the roller cam, roller lifters, roller rocker arms and aftermarket rods your looking to add around $3000 more to your build than is necessary for your intended use of street driving. Just trying to help you get more more smiles per mile out of your build and help you spend money where its needed.
