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So far I am at a loss to guess what is wrong. What color was the smoke from the tailpipe - blackish, blue, or white? What color are the spark plugs - a beige, or medium brown, or dark? Is it driveable so you can find if it will accelerate more less normally? Is it loosing coolant?
I always associate 'spark knock' or detonation as happening in an engine that is way too far advanced, or has too high a compression ratio (which wont happen unless the engine head has been off - and the engine got incorrect pistons, a head that was milled down too far, a custom head gasket that was too thin, etc.) or that the engine is running very lean or very much overheated.
And when did the spark knocking begin? Was it when you replaced the timing belt, etc.?
I presume you know the difference between detonation (high pitched tinkling sound) and the knocking noise of a mechanical nature.
 
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