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Around 3K was the rpm I heard the same sound. Found 3 broken studs. Sounds something similar to a loud muffler. This is on a 82SC with 115K on the clock.
When it starts getting louder it's the head bouncing off the cyclinders.
If it's the studs you've got a couple choices, replace only the broken ones (bad choice #1), replace only the exhaust studs (uh, maybe), replace them all.
I used Raceware and replaced them all. Used this as an excuse to rebuild the motor so I can't give you a price.
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