What are torque specs for rocker arm nuts on 75 Chevy 350 cubic inch?

Rocker arm nuts are not torqued on a small block Chevy. If it's a hydraulic cam, set the nut for zero backlash on the base circle and preload the lifter 1/4-3/4 turns. If it's a solid-lifter cam, use feeler gages to set the backlash per manufacturer's specifications.