Drum to disc question

Yes you will have to buy lines from a 73, I bought mine from Jims auto parts. He has great prices. Stainless hard lines are kind of a waste. If you want a cool trick, take the regular steel lines and then take a scuffing pad and scuff up the brake lines, after you scuff them up spay some clear coat from a cana spay them, they look like polished stainless. Save the money, I would buy stainless flex lines. Hope this helps