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For the lifters to be that bad they had to have given you some type of clue. I know they had to be tapping almost from the start. This is why I tell my customers to break the cam in and then pull the filter and cut it open. If all is good put in another qt of oil and continue. If there is a problem you will catch it before it becomes bad.

As far as EOS and Zinc additives I agree that they are old school and not really the right thing to use. There a several very good break in oils available exactly for this reason. Any type of oil additive is a crap shoot. It may or may not properly mix with the oil and might even react badly with the original oil additives. All of this information is very well documented.

Are you certain that the cylinder heads were set up properly for the camshaft as far as valve spring pressures and travel ? If it was a dual spring did you take the inner spring out for break in ? This is almost universally recommended.

Just thinking out loud. Hate to see stuff like this.
 
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