Here is my input. About 25 years ago, I got a cheap pair of Headman headers on my 69 340 Barracuda with PS. They were a pain to install, and the steering linkage does go through the driver's side tubes. Actually, the passenger side went in fairly easy; the driver side is the treat. All I had to do was dimple one tube a bit and grind on one ear of the PS box a bit to get them to fit. I eventually had them coated,, and they look great. I may get TTI someday, but these are working fine for me now. I jack the car up as high as I can get it, unbolt the motor mounts, and feed them up from the bottom. Passenger side is not too bad. Using a block of wood under the passenger side of the oil pan, I lift the passenger side of the engine up a bit and the header slips right up. Same with the drivers side, but much trickier. You have to hold your mouth just right. If they won't slip in, I can almost guarantee you that the car isn't high enough.
