Sounds like you may have a worn rocker/pushrod. See if you can determine which side and pull that valve cover. The old chebys would clog up the two exhaust pushrods on either side of the heat riser port that goes into the intake and then no oil would go to the rockers. Check those middle ones first
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Bill Heiser
90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter
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