When I changed my 70 to 5 lug I took all my parts off of my 71 donor truck. If I am not mistaken 68 rear end is different than the 70 one, so yours install might not work. All I did for the rear is take the axles out of the 71 (measure them) and put them into the 70 without any problems at all. For the front I took the upper control arms, master cylinder, proportioning valve, spindles, brake lines, and rotors. I had to replace the lower ball joints and I don't remember anything about the tie rod ends, but it has been 5 years, so I can't remember all the details.
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This is only my opinion and it is subject to change.
70 GMC Short box stepside Blown 388 Stroker
72 K/5 Blazer 350/SM465/205
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