Price seems high to me. Plane jane with a 6, rust and mechanical issues....offer 7-800.
My 69 Suburban had rust on the firewall, both sides. I know the farm truck(71) is rusting from the inside out above the windshield.
Rockers are easy enough, is it both the inner and outer?
Tons of parts for these trucks, real easy to lose focus on the current project and spend time and money on the beater.
Round here you can find a decent runner for that price or less, rockers always need to be done on the PNW trucks.
Keep looking
Dan