I run a 742 case with a mini spool with 4.10 gears on my 67 Dart.
Runs 10.70's
Weigh's 3000 lbs with no driver.
Over 300 pass's on the case.
I have also run 741 case's
I agree- Womanator and I have a friend who has a 70 440 blown Cuda that runs low 11's high 10's- all steel body- he's used all cases with no problems. NOT saying that you CAN'T break them though!