The current EQ heads are the 318 version of the old one. The 360 version didn’t return but that’s just what I have read. PIE can make the 318’s better than the 360’s.
There is no such thing as a 5.2/318 vs. 5.9/360 head in the Magnum castings. They were the same head regardless of displacement. The factory never had a different casting like they did back in the LA days.