SRT-10's have 1.73 ratio roller-fulcrum rockers. Any gains by going to 1.7 T&D's or the like are from valvetrain stability due to lighter components. the OEM rockers do not have roller tips, and are steel. T&D's have roller tips, and are Aluminum.
If you want a SERIOUS set of rockers, go with Jesel J2K Mohawks in a 1.75 ratio. Lighter than T&D, Stronger, smaller, roller fulcrum and tips... and the correct ratio.
Oh... and more expensive too...LOL