Of the two mentioned, I'd personally go with the Ridetech system, since it comes with the drop spindles and control arm parts.
However, you didn't specify if your truck already had disc brakes, etc., so I'm assuming you still have drum brakes, so you still need to buy rotors, calipers, brake lines and bearings. Next, you'll probably want to upgrade ball joints while rebuilding the stock control arms and replace the worn out pitman arm, idler arm and inner/outer tie rods. Also, you'll still be using the stock power steering box(if equipped), which may be ok, but the stock pre-73 boxes are wide ratio boxes, so a quick ratio box or 73-up variable ratio box would be a good upgrade.
By the time you add all that up, you won't be far off from a whole suspension kit like this.
https://totalcostinvolved.com/produc...o-touring-ifs/