I live on Big Island Hawaii, so choices are a bit more limited. I’ll look around for a clunker car with a #22 head from being updated. Who knows might get lucky.
Since I’m not in a hurry to have the engine built and going, I have time to look for one.

If worse case for pistons and need to get new ones, are there pistons made by same company that makes them for Mercedes, but not in Mercedes box?
Who makes them of equal quality as Mercedes ones?
Who sells them, I tried to find dealers on line, but didn’t have success.

Cheers, Allen