Backfire throught the carb is a lean condition. Make sure all your holes line up for accel pumps. Maybe a gasket not lining up or something like that. Without engine running open up the throttle and watch the action of accel pumps (did you change the cams on the throttle linkage?) Then look down the venturis and watch the spray coming out of the nozelles. Make sure pump arms are adjusted right.
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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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