Well, I have no experience with BBC Hookers, but I can tell you that my SBC Hooker Super Comps fit like a glove. I'm very pleased with the fitment. No dings, no fussing, no nothing. Now, about that ceramic coating I paid extra for....grrrrr........
They might not be worth much (if any) in E.T., but the fitment might.
Hey, I think you can order the regular Competition headers from Summit or Jeg's, test the fit and if you don't like them...you may be able to send them back. Of course you couldn't ding, scratch or damage them, but it might give you an idea.