ok, I know you guys get tired of people like me who ask this stuff but I'm at a loss why my car still knocks a little. ok he's what I've changed and has thrown me for a loop, I have upgraded to a MSD distributor, 8.5mm MSD wires, MSD coil, and autolite 25s, and run 93 octane. my timming is set at 10*. people I have talked to said I should be to bump it up a little with all my upgrades to the ignition but I can't. is there something I'm missing? Would a box help me out? thanks ahead of time for your help.