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If you are going to do those, you might as well do some kind of cold air intake to get more air to the cam and out the headers. And if you are going to do that, you might as well get your throttle body and snout ported. And if you are going to do that, you might as well get new pulleys. Get them all at once and only have to pay for one tune.
But in answer to your question, valve springs. I would do the trunion upgrade while it is all apart.
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