You're right Jim, I looked and the o/s valves are no longer available. I don't have a press. I wonder if I could drive the guides out with a drift and hammer once I warm up the head with a rosebud? After thinking about this, since it's making what appears to be decent compression at 110PSI dry, I'm thinking that once the head is off, if the valves and guides are seriously worn as you describe and if the bore looks good, I might just redo the head and slip it back on without doing the bottom of the motor. That said, you never know what you're going to find until it's apart. Thanks again!