Pat, for parts off the donor truck, you will need..... spindles, rotors , calipers, lower a arms, centerlink & tierod assys, master , lines,hoses & prop block. Also you need to install new balljoint assys(go for the yr of the spindle).On the balljoints 71-72 are the same, 73 up the upper ball joint & outer tierod have a different taper. At the rear on your 68, the best /cheapest way would be to swap a 71-72 diff in (complete)....67-69 housings are 1 1/2" narrower that the 70-72(70 is 6 lug, but the 71-72 axles shafts will fit. Good luck.....AL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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