I'm in the parts collecting stage of my '57 Chevy gasser project, and someone else's thread about which rear to go with got me thinking. I know there is a strong preference for the Olds/Pontiac rears, and I know they are much stronger than the original Chevy rears and "look" right in these cars...but what about the 9"? I understand that in the late 50s-early 60s, the Olds rears were more plentiful, and an easier swap (bolts in with factory leaf spring mounts, right?), but for a late '60s-early 70s build (yeah, maybe slightly OT) weren't the 9" rears becoming more common in these cars? And with a nodular case, and 31 spline axles, wouldn't the 9" be stronger? I haven't ruled out the Olds, but could someone tell me any advantages it may have? I can't imagine that parts for it will be any cheaper than 9" stuff.