ive got a ford fe 390 that backfires when starting up.it has a crane rv cam holley 1850 600 cfm carb long tube headers and 9.5 to 1 pistons it was rebuilt 5 yrs ago.problem started after tossing the draft tube and putting in a pcv system in place of the draft tube.When it runs ive got 20hg of vacuum at thebaseplate vac connection.timing is 10 btdc.It alsdo has a pertronix ignition.
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