Is there a downside to te mancini mopar conversion kit? It works on 9" spindles which is great for me, but I'm gonna have a 360 eventually replace my 225. Will the 9" kit be to weak?
Chryslers' engineers didn't consider their drum brake application ball joints to be strong enough for disc brakes either.
Everything designed back then is more substantial than whats found under todays passenger cars though.
I dont think those offering the aftermarket brake systems are assuming any liability for ball joints, spindles, etc, not supplied by them.