I bought one of these years ago. Fine kits. The only thing I did, because I worry about things like this, is I ground a bunch of extra weight off the inside of the piston dome.
I also bored the wrist pin out for lightness.
Couldn't install such a heavier piston on my MO2 standard rod and crank.
Also, watch that the original head will probably need machined for proper squish band. My piston hit the head. (edited)