Try TA Perf., Kenne-Bell, Poston

Have You tried TA Performance, Kenne-Bell or Poston ?
You can usually find their ads in the back of HOTROD magazine and the like. I think between the three of them, your headers should be no problem at all. E-mail me if You have trouble locating their addresses or ph. nos. ( jkalltheway7@juno.com )