318 swap headers wont fit.

i have a 67 vailant that had a slant 6 in and i am putting a 318 in it with the stock slant 6 k member with swap mounts. the mounts line up good and everything just the driver side header wont fit. i asked around and people said i have to put the header in between the steering rack arms. i did do that but still cant get the headers bolted to the head. its just to tight(that's what she said by the way) any help.? the headers are long tubes(not sure the brand) has power steering. do i have to have both headers in the car before i drop the engine in? i still have the starting on because i dont think i can put it back on after the engines in. thats all i have to tell you i think. im only 18 and this is my frist swap so i dont know what the hell i am doing lol thanks