I had factory AC and power steering in my 72 and I went with Hooker Pro Comp, they were $170ish from Jegs when I bought them about 10 years ago. I didn't have any problems with them fitting other than the drivers side had to go in from under the car and the AC box really makes things a PITA, especially on your furthest back bolt next to the firewall; I think you'll have that problem with any headers though. If I remember right I ended up either bending a wrench or cutting the head off of one to make it fit back there. I don't know how far out you are on buying a set of headers but I'll be selling mine in the next month or two if you're interested.