What plug is that? You definitely have some distribution issues but number 8 looks the best at cruise. The rest of it would be a guess with the shells on the plugs but if it's that pig rich at idle and cruise it's probably pretty rich at WOT.
Edelbrock Magnum airgap. Edelbrock 1406 carb. It's got a 5.2 Magnum cam. Don't remember all the specs right off, but I know it's 112 lsa and 110 installed center line.
