I have run NOS on 302 and 351W. Never on a 289, but don't see any real difference.
Keep it to 100-150 HP shot. Don't lean on the button. If the engine is sound you shouldn't have any problems.
Watch the fuel pressure. NOS takes alot of fuel when you're on the button. I would run a seperate electric pump just for the NOS. Never goes lean then.
If the gaskets are leaking now, sure they will leak more later.
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