Valkman, I would suggest using a Mopar Performance 340 internally balanced damper. If you're budget allows, a Fluid Damper would be best. Rubber dampers are specifically tuned to the rotating assembly point of resonance. This system resonance varies depending on many factors. The main factors are cylinder pressure and crank stiffness. Most builders have no idea what the crank system resonance frequency is after performance updates. Fluid dampers work over a wider range of frequencies unlike the elastomer type.