I just saw a Granatelli steering shaft that is supposed to clear long tube headers, i think it is a solid steering shaft for manual racks and there's also one for power steering racks...I saw it in my next generation mustangs catalog. If you have adobe acrobat, you can read it here:
http://www.nextgenparts.com/mustangc...spension_a.pdf and it's on the top left of page 8. you can also go to:
http://www.nextgenparts.com/mustangc...tangdirect.htm and they have a download of acrobat for free.
It's part #MSS79 and it's $140
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'84 Mustang 5.0 LX
My car