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Planning to do a refresh on my 73’ Imperial. Manual says 8.2 compression on the 440. Would a 906 head be an upgrade to bring the compression up to say 9.5 or is there another option/recommendations? Thanks.

Need some thoughts. Every carb I have tried is bogging at idle and above and leaving fuel at the bottom of the intake. Floods and stalls. 3 Edelbrocks, one Holley and one Slayer tried. What I have is: - rebuilt engine and components - RV cam - 906 Heads (rebuilt, ported and polished) - MSD...