46 chevy 1/2 ton

After replacing my master cylinder,one of my brake lines, bleeding the brakes and adjusting, I am still running into adjustment problems. It seems now the back brakes are catching more than the front. I am think of just redoing the hole works, Jim Carter has a full rebuild kit for this but am not sure if it is worth it. I am planning on going as original as possible but the brakes are pulling me in different directions, Should I overhaul what I have or should I upgrade to power brakes? Any words of wisdom would be great. Also sorry for any mis-spelled words :rolleyes:
Thanks in advance
Ed