Rattling tin can on right side, under throttle...

Well if it was a rod it would be all the time, not only under throttle. Detonation would be whole engine has distintive sound. Rattling tin can I would think, it was an exhaust rattle like a heat shield on the cat. But that sound is much different from what you think it is so, who knows.
 
I'm with Brian on this one, I had that same problem when I had a 89 sc and it turned out to be the heat shield. I just bought a few clamps and wrapped them around it. :D

Cheers,
Luke
 
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