Need a little help!

I need to get a new master cylinder because I have done a front and rear disc brake conversion. I'm not an expert in master cylinders or boosters (and I understand you pretty much require a booster for disc brakes?)

My question is, will the following master cylinder/booster combo work in my '70 Dart? It mentions that the MC is for front disc brakes...but does that also mean it could be for rear discs as well? And I believe I need to go with the 7" booster otherwise I will hit the headers.

http://www.summitracing.com/parts/SSB-A28142/?image=large

Any help is appreciated, I've never done a disc conversion before so any insight is valuable to me!

Thanks,
Craig

Are you going with fender well headers? Just wondering why it would hit the headers.

That kit is listed for GM cars.