HI 74Scamp, regarding your Cordoba spindles, I have the same application already in place.. I have a 73 duster that came with drum fronts. I chunked the front drum spindles off a cliff at some environmentalists.. (just kidding I like air), now I read here that people want them.. The upper control arms accepted / already contained the large ball joint required for the factory disc spindle swap I am pretty sure all 73 up A-bodies have the required A arms and ball joints, regardless of drum or disc. The factory lower control arm accepted the stock "73 up A-body" lower ball joint for disc brakes (given), which will bolt directly to your Cordoba spindle(s). The bolt up / bolt hole alignment of the lower ball joint works perfectly using fine thread grade 8 bolts and nuts that you will have to measure the required length prior to picking them up at the locally owned hardware store Nuts are required because there are no threaded hole portions on either your spindle or lower ball joint in this application (use of locktite is probably typical on the threads). There is no rotor or spindle or lca interference regarding the bolt/ nut config. Like I mentioned, the upper ball joint remains stock for 73 up a-body (larger) and fits the Cordoba spindle. I did this exact swap using a 77 Cordoba with the 11.75 incher rotors, keep the caliper mounts with the spindles. Purchased new rotors and calipers at a local parts store for cheap. My caliper mounts are pin type which I hear may not be as desired because they flex more. My spindles had the calipers behind, so there is a longer brake hose required if yours have the same orientation. I have not had it on an alignment machine yet, but according to bigblockdart.com there are some minor changes to suspension geometry, some of which are beneficial and some of which may be very slightly less desired. Most of this info has been mentioned all different directions already, I just though I would chime in here.
