I need some help with finding headers for my 77... I believe this 350 was dropped in not original... I've read a lot. Of horror stories with headers not fitting right so I'm not sure which route to go. Do I want long or short? Coated? What kind of material? Brand? I'm pretty naive when it comes to this stuff so any help would be greatly appreciated. I want something that will last but I can't afford to spend a crapload either.