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Any stock head is going to be "crap" when compared to a decent aftermarket one. You can get to 400hp with Vortecs but with the cost to rebuild them and the price of some quality offshore heads I'd just go aftermarket.
That being said if a pair of Vortecs fall off a truck and all they need is springs and guide work then you'll do just fine using those- but since they're thin castings don't sink a hell of a lot of money into them.
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