A bit of previous pitting behind the crosshatching. Also the valve seats look a bit wide. Probably touched up at some time without narrowing them. My 289 Ford seats look the same. The ld method was to knurlize the guides. They actually wear quicker. You could put cast iron guides in or bronze. I would check valve length and look at either new Hemi or LS valves. They are lighter and you then use the lighter beehive or conical springs and retainers. Hemi valve stems are 5/16 while LS are about 0.003" larger diameter at 8mm. Then it is to find a compatible spring.
