[CSX 4027]

Your initial timing to 10 will have no effect on detonation. Actually, you should have more like 18 initial. Idling at 10 will cause your exhaust pipes to heat up and potentially warp the side of your car and burn the paint. If you are detonating, you must check your total advance at over 4000. I have seen a few messed up distributors look good at 3000 and either turn around at 4000 and 4500 or take off. I know. I had one and it was set up by one of the infamous 427 genious's.