Mustang shory headers won't fit, it'll hit the steering box. But, from what I understand, newer truck style shorties will fit. check out the headers at www.fordpowertrain.com They have some nice shorty styles.
It's one year later, and I finally got around to painting and installing the Headman shorty headers for the late 80's early 90's F-150 on my '67. They fit perfectly, with plenty of room to clear the steering and shift linkage on the driver's side. Thanks for the replies!