Well, I borrowed a hand made tool to install the guide without removing the cam. I then used a center punch to put 3 rings of 6 punches each on the outside of the guide. Cleaned the head and guide, coated the guide with lock-tight and installed in the head with the borrowed tool. I installed the valve spring and then hit the top of the valve several times (again using a handmade tool). Installed the adjustment shim and rocker. Waited about 2 or 3 hours, restarted and the engine was as smooth as ever.I was given this procedure by an old MB mechanic who said he has know engines to run another 100K or more and never having any more problems. He also said sometimes it doesn't work. I guess I was just lucky for a change. I have another set of heads with bent valve that I am going to rebuild and keep in stock, just in case I need them. Thanks for all the responses.

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84 500 SEL (307,xxx miles)