Alabama-Ohio State
LSU-FSU (obviously not now, but idk if they ever played before. would be cool to see those two powerhouses play once FSU is good again)
Clemson-USC
Georgia Tech-Oregon
Miami-UGA
Florida-UNC
Auburn-Texas
idk breh I gotta disagree with you here. Louisiana Tech has played Grambling and SU plenty of times. Its way passed due for LSU and SU to be playing. We know what the outcome will be, but LSU has the best PWI fans, and SU has the best HBCU fans. Plus both bands are near the top for their styles.
Once LSU plays SU, I think Alabama and Tennessee will be the only SEC teams who have never played HBCUs