Yes have the car in the garage and driving my spare. My spare car is a 75 Buick Century. The car never has any problems just sits faithfully waiting for the day when one of my newer vehicles takes a dive. This valve issue sounds dire. How do you Sea-foam this engine? I used Sea-foam on my 87 Plymouth once but it is a single injector and you just poor down the throttle body. I've got this gizmo coming in tomorrow that you fill up with injector cleaner and pressurize it with air and the engine runs off of it until the thing is empty. You feed the cleaner into the service port on the fuel rail. Are you familiar with this method? Will an engine run on straight Seafoam? Maybe this treatment will help the valves as well. I like your thinking on getting all the injectors refurbished but would like to try simple things before taking it apart.