[gentoo-user] must I mask gnome-3.8 until I am running systemd

[I will be going to systemd since it is aparently required for
gnome-3.8.  I first want to try systemd on a test system so am building
that one up.]

On my main system (currently running openrc) I have masked all of
gnome-3.8.  I wonder if this was an error and I can remove the
mask.  Is it the case that

1.  Running openrc instead of systemd means you must mask gnome-3.8

or

2.  It is ok to emerge gnome-3.8 without a mask but some pieces will
stay at 3.6?

In other words can I eliminate my file
  /etc/portage/package.mask/gnome-3.8
with all the 3.8 builds?

thanks,
allan