well i got my old bone shaker out and it did not fix its self over the winter it still will spark knock under acceleration. timing is set at 34 total in by 3000. 474 stroker dual 600 edelbrocks 4 gear 355 posi. 10:1 pistons and msd ignition. my carb jetting is 95 primary 87 secondary with i believe a yellow spring. seems to spark knock when the secondaries start to open. am i going lean on the secondaries? i think so. can a few of you fellas list your jetting and engine combos so i can compare ? plugs seem to be nice and tan but it does not see a lot of high rpm full on driving. any advice or ideas would be helpful. will have pictures soon! thanks Brian