Early A-body Headers

So, what this appears to be is a cloning of the Spit Fire Headers built by Harold Johnson, right? If this manufacturer has a licensing agreement with Harold then you are golden. If not, better do some research and see if Harold took out a Patent on his design. I just installed a set of Spit Fires on my '65 Valiant and they were no picnic to install, especially the passenger side. Found these on eBay so nobody get your hopes up about Harold shipping again.
Bob