Both Crane and Comp cams have 5.0 specific springs that will handle 550 lift that come with retainers and keepers (crane does I know because thats whats on mine) Since you have aftermarket pistons you could go wit h1.7s
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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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