Agreed, but my point is that all the large tube headers for 67+ units I looked up dump the drivers' side #1 primary out through the k-member in front of the lower control arm or through the fender (Hedman, Hooker). Since the AlterK longtiudinal will occupy the space where the opening in the k-member used to be, I can't use that style of header (I confirmed with Bill at RMS). I am hoping there are other manufacturers out there that don't use that k-member opening, but I'm not holding my breath. I have thought about trying a header from an E/B body small block but Bill said no dice.