1968 318 questions
Those dished pistons do not look like the '68 - '69 flat top 9 2:1 with valve reliefs.
Here are the pics of '69 Pistons below and I have another set of '68 pistons that look just like them, factory mopar 318. They sit .040 ths down in the hole at TDC, and have full floating rods.
302 Heads, 714 castings are the same head too. Work out nice, even have bigger push rod holes in them from the roller engines they came out of.