Well, little late but never rip the lifter out the bore. Take the cam out and drop it down. Just did one today like that. The cut's in the lifter bore will probably bleed oil pressure. Hopefully not too much.
You should replace all lifters and use the cam you want. We pull the oil pans to clean them out but could probably just flushed the motor 3-4 times with cheaper oil. You want to do this because any small metal material can get into the new pump and lock up the pressure valve in it. Seen that many times.
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