I am considering putting in 1.6 roller rockers on a 355 sbc. It presently has stamped 1.5 rockers. My lift is .454 @ .050 so this will up my lift to about .484, Duration is 216 @ .050. I believe this has a little effect on duration as well. Will this increase hurt lower torque of the motor and if so by how much? I have a heavy 4 speed manual car so I need the low end torque. It is about 3600lbs.