/6 headers

I have herd that 66 and earlier abodies don't have any headers on the market that will work:read2: on another site.
But that is just here say so far.:???:
I am worried that I may not be able to get a set any where:angry7:
that will hook up on a 63 valiant 170 /6.#-o
I may have to settle for cast iron .:wack:
I am going to pick up the Offy 4bl intake for sure.
and I will clean up a 170 /6 head and not go with 225.8)