question on brakes

[va_tlc]

hopefully someone will have the answer. 72 cab.. 70 4x4 frame. drums all the way round. put new shoes on all 4 new wheel cyl all 4. didnt turn drums pretty smooth. new master cyl. 70 model. the por valve i have is the 1 that was on the 72 cab the wire hooks up under side of the valve. my problem is when ya hit the brakes it pulls real bad to the left. think it could still have air in lines? or wrong porp valve? i did put new adjusters on too. any thoughts? thanks n advance