1973 360 block thickness?

I've been preachin this and gettin argued in the corner for a long time. But the book has it incorrect about the 74 block. It's the 71-73 360. The same years they made the 340 and 360 consecutively. ...and it's EASY PEASY to confirm. Just take an early and late 360 block and knock a freeze plug out between two cylinders of each and compare the space between the cylinders. You'll see much less space between the cylinders on the early block. But like Guitar Jones says, best bet is to sonic check them, because core shift was a problem.