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I put a 6" lift in my 77 and wound up with 5"s of lift when done. I run 33's on it and it has plenty of fenderwell showing for the fenderwell exit headers.
BJ
1977 F150 4x4 Flairside 400/C6
Check out www.superlift.com for tire/lift information. You can even call a 800 number and they will help you with any information you need for your rig.