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I know it really doesn't help you much but when I did them on my 98 Cobra I had to disconnect the steering shaft to get them done. Haven't done them on my 5.0 yet.......yet I'm sure if you check there's probably a thread or two on this on here.
How much is it hitting by? When I did the shorty headers on my car, my steering shaft just barely rubbed and i was able to loosen the bolts on the steering column move it slightly. I gained like 1/4" - 1/2" in clearance.