Header Question

Im putting a 6.1/HDK/T56 in my 68 Valiant. Question is what aftermarket long tube headers work in our A bodies? Is it only TTI headers? I was hoping that maybe someone had tried to fit something else. Thanks in advance. Also apologize if this topic has been beat into the ground, I looked before posting.
I don't know that any other brand is going to make it as easy as TTI did for me. They asked what I was using and made the headers for my setup. I have zero issues. Not a header ding one! I know TTI headers get a bad rap but trying to save a couple hundred dollars can create a couple thousand in headaches!
My combo is 6.1/TR6060, HDK, Schumacher(I think) mounts from Denny as well.