Hey man if you are using dirty dingos and you want to go long tubes go to
http://www.schoenfeldheaders.com/ .Call them before ordering and tell them you have dirty dingo mounts .They built their long tube headers around the dirty dingo mounts and they are a made in usa company. Both Brent at dirty dingo and the folks over at Schoenfeld can confirm this for you. I ended up getting the ebay ones that Brent told me that would fit 73-87 on ebay made in china. 200 for the ebay ones compared to the 400 schoenfelds , not bad tho would like to try those long tubes they make.keep us updated