So, the SEC posted a All Time Final AP Football Poll. It is fairly entertaining and takes into all the AP polls since the beginning in 1936. Their methodology is pretty straightforward:
From 1936 to 1961 the wire service ranked 20 teams. From 1962 to 1967 only 10 teams were recognized. From 1968 to 1988 AP again resumed its Top 20 before expanding to 25 teams in 1989. Points were awarded based on a team’s finish in the final AP poll each year. Points were awarded on a 20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1 basis from 1936 to 1988, and a 25-24-23-22-21-20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1 basis 1989 to the present.
They gave out half points for ties which was also a good move. There is a flaw in their methodology though. If you were ranked before1989, you got an 5 points less than you would have if you had received an equivalent rating since then. This is unfair as teams shouldn’t be penalized for playing well before the AP voted for 25 teams. To be an accurate measure, being ranked number 1 in 1950 should weigh the same as 2007.