I personally wouldn't bother with a big bore kit until cams are available, and I'd also get the head porting done too. A big bore alone won't really accomplish anything.
Now, don't get me wrong, I'm not bashing meyerz for doing it... he had a valid reason since it's very little extra work to pull the cylinder and replace the piston since the head already had to come off... but if your machine doesn't need it, don't bother yet.
Rob