If you do purchase the headers from WCC, be warned, the header flange/tube shape provided is a compromise when fitting up against the Super Cobra Jet exhaust ports (i.e. the header flange does not match the SCJ exhaust port). My SCJ Kasse head ports are 2.13" tall and the WCC header flange port is only 2.00" tall. Not enough material to open up the flange either! If you dont have SCJ heads, you should be ok but you must confirm what WCC is selling and measure your heads to ensure they fit the port correctly ! .
It appears the WCC header flanges used were designed to fit up to standard 429/460 exhaust ports not Super Cobra Jet ports. Yet another discovery.
My advice is to have your headers custom made by a shop with loads of header fab experience as close to you as possible.