The tallest stock replacement pistons I’ve come across were the TRW forged L2329F, which are listed as having a 1.759” ch, and valve pockets worth 1.5cc.
I am not sure, my book does not list them. I mostly built 273's and 340's since they were high performance. Not many 318's needed rebuilding, they ran good forever. I did install 360 heads, cam, and 340 induction on more than a few 318's though. Rarely replaced pistons, as the short block was usually OK and the owner did not want to spend the coin.