Brake questions

Hey folks, I've been looking through the forms to see if anyone has already answered this question but I haven't found what I was looking for. I have a 1970 Dodge Dart Swinger with drum brakes all the way around .The car does not have power brakes .I want to upgrade my front brakes to discs. Do I need to install power brakes for that? Also what size would I want and who is a good distributor for something like that?