In a Drag race car 1/4 mile tire weight will have less effect. As you are slowly rotating that tire speed from 0 mph to a 120 mph [Example] over the course of 1320' ft.

You on the other hand are mud racing and rotating that tire rather quickly to 120 mph. Once there rotating at about 120 MPH against the resistance of the mud. The extra 34# can add a significant torque resistant in rotation in addition to the mud its trying to rotate in at that tire RPM.

Also At what Diameter are you talking about??

As far as torque goes wider lobe seps reduce the torque peak but will broaden the range of the torque. So you will see Less torque but with the broader range of the torque RPM band you will see more HP. RPM dictates the HP. At 7000+ rpm you are not wrong in adding LS mike