The latest issue of When Saturday Comes has an article describing trips to away ends of grounds. The writer recounts a trip to the Dell and standing in the Milton Road end as an away supporter, with the family centre in the chocolate boxes above him. I don't ever remember the Milton Road end being segregated for away supporters. I think that he must have blagged his way into the original location of the Family Centre, which was the right hand side of that end.
All I remember of the original Milton Road end was that you couldn't see very well when it was packed, but that the rebuild of the early 80s was a huge improvement and made it a great place to watch Saints.