Awhile back while digging for something else in a boneyard, I found a set of '70 disc spindles in the trunk of a 70 Cougar. I want to replace the manual drums on the front of my Mustang with these disc spindles. I have a dual master cylinder. Questions for those that have collectively done it 100's of times before: Will a 'stock' '70 disc brake setup work with 14" wheels, or do I need to find 15's? Should I move to a power brake booster? Thanks for your help.