Your question does not have much context, so I am not sure how well I can answer your question.
Sounds like your axle was swapped in at some point? An IH axle only uses three ubolts on the front axle. Either you have a 74/75 axle if it has external locking hubs or a Chevy axle. The suspension kit doesn't care what axle you have, as long as you get the correct ubolts and plates to make it work.