Disc brake conversion 67 Dart

I have a 67 Dart GT convertible that I want to put front disc brakes on. I want to use spindles off of a 73-76 Dart. The question have is, because it is a convertible, I have 10" drums now, do I need to change the upper control arms? I am new to this site, and I have gotten a lot of good information from it so far.:-D