Exhaust gasket leak, or a sticky lifter.  You can try dumping a quart of tranny fluid in with the oil when you change it.  Tranny fluid will help clean out the engine a little better, old trick.  The 350 in my 86 Cutlass has a ticking noise, but I know it's a leaky header gasket.  if it's a pinging noise, the carb maybe running lean.  Try adjusting the carb on it.

Tom

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