best headers for 69 dart?

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personal hello! I'll be back here again with a new problem, got the short time a couple of Mopar Performance P4532900 heads, but it is a rare head and outstanding, and realized something, drilling exhaust is standard LA and exhaust ducts are MAGNUM, I was told I would have to use a exhaust model W2 ECONO this that right?
 
personal hello! I'll be back here again with a new problem, got the short time a couple of Mopar Performance P4532900 heads, but it is a rare head and outstanding, and realized something, drilling exhaust is standard LA and exhaust ducts are MAGNUM, I was told I would have to use a exhaust model W2 ECONO this that right?

Those have the w2 pattern so you are stuck with tti for a header that doesn't hang low... Unless you drill the heads and then the ports may not align.
 
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