Hi,
In the VIN's table of the site appears the Sandcast pair 578/E742.
As you can see here (video of a 1969 K0 from VIC) :
https://www.youtube.com/watch?time_continue=24&v=uN11jG1eyBU the engine appears with number E1000742 and the text attached to the video indicates that "This one has an even lower frame number than the first one with the accompanying differences: number 742" so the frame number is 1000742, the same as the engine (?).
That's strange, isn't it ?
Have a good day.