headers

i need to build a new set of headers for my 68 dart. it is a 414 inch small block with b1 smallblock heads. i want 1 7/8 tubes and 3 1/2 inch collectors.anybody out there with these heads? what did you use? where can i buy flanges or collectors? thanks

http://www.spdexhaust.com/index.html

i did use a set of TTI flanges in my 65 valiant 418 motor and B1's, p.n.-FLG-340W2-2( W2 Econo Heads)about 48 dlls