9" drum to disc conversion confusion

I just put an SSBC a153 kit on the front and a Summit BK1329 on the rears of a 64 Dart. The SSBC kit was a snap once I got the proper early 10" spindles. The Summit kit was a bit of a disappointment though. The brackets the hold the calipers are 2 seperate pieces which make it a little flimsier than a one piece bracket would be and the ebrake seems like an afterthought which I got to work, but may be a problem in the future. Also, Moser axles with thicker bearing retainers left the kits bolt too short on the axle flange. The price was very reasonable though.
As far as the 9" drum spindles, I agree that they are a bad design and should be replaced if you drive in traffic anywhere. The weight of the car and any possible inertia you may throw at it rely on the bolt only, no end loading. And they do tend to break at the most inopportune moments...