If you do go with the bigger headers, Tubular Automotive are a very nice header. Well made and easy to install. They are designed for the strip and do not have a collector flange and are a multi-piece design on each side. A collector flange can be welded on for exhaust hookup. Easiest headers I have ever installed. I did not have to lift the engine or remove torsion bars or steering linkage. Just need to know the right order and angle to put them on each side. They do sit a bit low in the back. I ran the 1 7/8' version with adapters for my W2 setup in a 70 Dart which was strictly a bracket racing car. TTI would be a more street friendly header for ground clearance and the rest of the exhaust setup.
See some pictures below and their website. Page 11 of their catalog. TDR 8 is their part number. The head mating flange can be made for standard head or W2.