FootballOutsiders is slowly going further and further back in their DVOA ratings. They just completed the 1988 season. The Rams were 4th in the NFL in their ratings that year, and along with the 49ers had a top 5 offense and defense:
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Jim Everett ranked 3rd among QBs and Greg Bell and Henry Ellard were top 6 at their positions. Pete Holohan and Damone Johnson were 3rd and 7th among TEs.