Conference ratings are at the bottom.

https://masseyratings.com/cf/compare.htm

The SBC is listed below, and I included the best and worst ranking for each team among the composite,

39 James Madison (best 3 worst 129)
50 App State (best 27 worst 79)
53 Coastal Carolina (best 16 worst 84)
60 South Alabama (best 17 worst 115)
78 Marshall (best 37 worst 106)
80 Troy (best 57 worst 105)
83 Louisiana (best 47 worst 110)
85 Georgia Southern (best 48 worst 109)
93 Southern Miss (best 64 worst 121)
97 Old Dominion (best 72 worst 111)
99 ULM (best 57 worst 122)
108 Arkansas State (best 81 worst 126)
118 Georgia State (best 67 worst 131)
119 Texas State (best 91 worst 128)

We'll see these be really meaningful after week 6 or so. Right now some data from last year is still influencing some rankings while others are strictly just this year's results.

Any ranking system that includes last year's data has always been suspect but even more so in this day and age considering the portal.