Hey Mike,
PLEASE do not shave the head any more then necessary!!! I can't stress this enough.
I STRONGLY recommend that you only take the minimal amount off the head - no more. Say .030" .
Removing more off the L series head has many drawbacks, include the possibility of head gasket sealing issues, timing chain aliment, cooling issues,
softening of the head material... etc.
ALL L-series engines should only have the CR altered buy the combustion chamber size, head gasket thickness & piston dish (or lack thereof).
FWIW, A particular well known L-series engine builder WILL NOT use a L-series head that has been shaved more then 1.5mm...