probably the cheapest route would be to swap in the later crossmember. I prefer the old steel bushings, & have kept the stock crossmember. I have 71-72 lower a arms, with 75 spindles, ball joints,tierod assys & centerlink. The swap can be done either way, & just depends if you have the eng in the truck or out. Its easier to swap the crossmember as a complete unit , if the eng is out of the truck. good luck,crazyL 
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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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