Are they truck headers or car headers? I didnt know there was a difference till I tried to put them on my 68 D100 (318). Turns out they were car headers and didnt have enough "sweep" to clear the tranny crossmember.
69 and newer have modern style crossmembers, 68 and older have 1930s style crossmembers. So you'll have a lot more room to play with. Steering column and starter will still present issues. But they "should" work.
They are truck headers. Good, I hope they aren't sold..Thanks guys. They have a long slant so Im sure they are truck.I have a set for a car and I didnt want to get the engine in and then "yikes".