I ran 295x50x15s on my 76 Century with no issues of outer lip rubbing. Put them on my 77 Century, same rims, and now I get a little rub. Maybe I am searching wrong but was there different rearends that might have been a little narrower? If I recall the posi I put under it came out of a mid 70s buick station wagon. The ride doesn't seem any different put that was the early 80s and these springs do have 30 more yrs on them. Also, does a disc diff and drum diff have the same specs on hub to hub length? Anyone know this answer? Thanks
