318 Difference?

04 Diesel said
Here are the pistons. Top one is from the 1970, those are not stock are they? The other is from the 1977.

Here's some pictures of what I have and believe to be factory pistons:

68 318 - has eyebrows:

View attachment 68 318 Block A03 B23.jpg

71 318 stock - no eyebrows, flat top:

View attachment 71 318 Block A01 B.jpg