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Make them long tubes first of all. And I don't see why anyone would not want to go with 1 3/4" pipes. Second, what year is your T/A? SLP headers for the LS1 seem to be a nice straight design. For the LT1, Hooker super competition headers are what I'm pretty sure I will replace my Edelbrock shorties with one day soon. Some people think even those are no good - nevertheless I would never pay over a grand (Canadian) for a pair of headers!
If you've got emission laws where you live and decide to buy headers without emission fittings, I wouldn't buy them coated. Get them bare and drill out the necessary holes, then send them to a place to get coated.
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