Tom, make sure you tear that engine all the way down again and have everything cleaned, even the galley plugs need to come back out and flush everything so there is no cam/lifter grindings in there anymore. check all the bearings for "junk" on them, if you don't you could do it again when you put it all back together. I would never run used lifters on a new cam, unless you had them reground like '54 3600 states,, and then do what Hotrod Lincoln said to do with break in. Sorry for your problem, but it all can be fixed once again for a few dollars more and then you will be back to driving your truck .
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