octane boosters?

Great info here. I appreciate all the help. I pulled my plugs and noticed that they may be burning under a lean condition. I opened up the adjustment screws on my edelbrock another 1/4 turn and it seems to have helped the detonation issue. Haven't had enough time to test it for sure but, I think I'm on the right track. I adjusted my carb to edelbrocks specs since I've had it and I believe they have you set it up to a best lean condition or something like that. With the adjustments now it starts to decrease the rpm just slightly and that's where I leave it.