I guess you can't help wonder why they would have taken the original 67 engine out and put a 68 in, I think this was only about 3 years ago but I have no way of finding out...
Back in the 70's I blew a number of engines on an olds. Didn't really care, I could get another From the junk yard for less than 100 bucks. Did lots of motor swaps, it was faster and much cheaper than a rebuild, and nobody cared about matching numbers on a driver.