Wondering If you guys could shed some light on some advice I received..

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Not sure if its true, but while at the local muffler shop I was talking to the owner about headers, told him about my setup and that I dd my truck. That being said he advised that unless you are going to drop some money and get a good name brand, such as doug throrley, you are better off finding a beter flowing exhaust manifold off a different 350, he said in my case a vortec or corvette application i believe would be fine.Not sure if anyone can shed light on this, he said cheap headers just dont truly seal up, that you will always be fighting leaks. what do you guys think?