Headers in my early A body...HELP

If you do a search for headers early As you will find hours of reading about all the horror stories and maybe some good stories too. There are a couple of stickie threads about installing Spitfires - the ones Layson sells are knockoffs of the original Spitfires (long out of business). Shameless plug - I got 2 sets of Spitfires and open to selling 1 set.