Screamingchief is absolutely right with what he is telling you. I ran into a similiar situation a little over a year ago where someone didn't check everything out one a 77 T/A that had a 74 400 with with 4X two barrel heads, the ones with the bottleneck studs. Wanted me take a look and see why it had a serious miss in it. All it took was pulling one valve cover to see where someone had tried to make an adjustable valvetrain out of a non-adjustable. polylocks on stock rockers. Result, broken rocker stud. Same deal someone had shoved a large cam into this motor and didn't set everything up according. Recheck everything as I know that the Comp that you installed is a really good cam when properly set up.
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