Advice / pointers on replacing valve seal

Hey, so I been kinda bouncing between this and my other compression results threads. All the plugs looked trashed and it seems to be determined that the carb was leaking and fouling the plugs. I pumped the breaks on the valve seal for the time being and am working on new plugs, wires, & carb . .
I'm doing the rope dance this week myself. I've got one plug that tends to foul and hope this is the fix.