Rering ??????

Right, unless you're confortable with purchasing the required inside-outside micrometers and are trained in the use of them. I'm not aware of your skill level, I on the other hand have been using mic's for 35 years, it comes down to what you're comfortable with. If you choose to use an outside shop ask around for a reputable one especially one that is up on cylinder honing and block decking if it's required.