Hi, wow, love those old trucks. FWIW I watched a friend working on getting a '35-'37 Chevy started. It still had some old gas in it, which varnished on the valve stems, made them sticky, and as a result bent some push rods. He took off the rocker arms, popped the springs, and spun the valves with a drill. Replaced the bent push rods and off he went. The truck ran really smoothly then.
