Guys, check out his original post; he is talking "center dumps". I have never done it in a car, but i have a set I use on the flatheads I run on my engine stand. From what I have seen (I have a set of Fenton's on my '51 which weren't supposed to fit), the center dumps will interfere big time with the steering box. I may be wrong, but I'd check carefully.
BTW the stainless center dumps I have on my test stand are very nice; even though they were made in China. You can buy a set for less than $100. Although the headers were great, the bolts that came with them were metric and didn't work at all. After I replaced them with the proper sized header bolts, it only took a little modification to make everything work fine. Why they would supply the wrong bolts is just beyond me; it's like a 99 yard drive by a football team, just to fumble on the 1 yard line. I guess they have accountants screwing things up in China too.