I Hate Headers!!!!!!!!!!!!!!!!!!!!!!!
You ain't kidding! I hate'em to!
I didn't have to do to much with the TTIs (67 Barracuda 360) . I had to shave a 1/2" off the Lakewood scatter shield on the passenger side. I had to take some off of the z-bar on the very bottom so it would not rub the header AFTER I installed a set of thicker motor mounts insulators in order for the driver side header would not hit the steering gear box (manual). But the brake lines was not a concern or proportionating valve. What do you have?