brake question

[stepside83]

hi im buliding a 1983 2wd c-10 step side, and i have it torn down to the bare frame, everything painted on it ready to put new brake lines, fuel lines all that stuff, my questions to you guys are, 1 im looking for a new proportiong valve for the front disc and rear drum set up from the factory, and a stock replacement are like almost $230 around here, so i was wondering if theres a aftermarket company who sells them a lot cheaper for my truck with the stock brake set up disc/drum? also looking to buy pre bent brake line kit if there is any out there where would i go to look and buy thanks again,