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Or go to any decent parts store and buy a set of rocker oil deflector clips. They snap onto the rockers so you can run the engine without the valve covers and the oil that squirts out of the push rods is deflected to the stud instead of showering your fenders.
I also used the deflectors. I don't know if this is the right way but it always worked for me and the adjusting part was done in less than 5 mnutes of running (hyd lifters). I would back each one off until I heard the clatter. Then turn them back just until the noise stopped, hence zero lash. Then shut off the engine and turn each one to the preload you use. Otherwise the engine would tend to stall trying to set the preload while running. If there is something wrong with this method, somebody let me know.