I'm ordering parts for my 2.1L rebuild and I am considering a piston kit so
I contacted GWAP
to ask if the QSC kit still had the deck height issue.  It seems they can't
answer any technical
questions and wouldn't give me an answer.  I was told that they've gotten
good feedback about them though.
I contacted QSC and they said that the issue with the pistons was corrected.
Just an FYI.

Anybody try their cylinder heads? Looks like just a finished casting.  QSC
has an interesting website.
http://www.qscusa.com/Piston1.html