Is this a small block or a big block? And $140 for headers?!? I can barely believe $300 for a pair, but I guess I'll have to take your word for it, rfk.
If you want them to have any sort of durability, you probably should be looking for a set of ceramic coated ones. Or other high temp coating. $140 steel headers sound like they will look like what you paid for them in about 3 months of driving. Sanderson makes some decent ceramic coated block huggers for a big block which I got for about 400 bucks, which I thought was a good deal.