Jim;
Don't know a whole lot about the old 427 blocks, but a buddy drag races a 1000 hp big block Ford stroker motor based on the 460 block.... 4 or 5 years ago a rod broke in half (alum. rods) at 7,500 rpms,took out a piece of the block on both sides just above the
oil pan about the size of a silver dollar or larger.They picked up all the pieces off the track and gave them to him in a box, he fit the broken pieces back in the block and welded it up and had to sleeve 2 cylinders, still running the same block today!!!!!!!!!!!
If the repairs were done properly, the block should be fine.... Worth???? have no idea..............
David