So i've been thinking about buying an Epiphone EJ-200 for two reasons:

A) I need an acoustic that I can just throw in the back of the van and take anywhere

B) I've always wanted a J-200 but can't justify the enormous price tag

So my question is, if I was to buy this I would want to replace the tuners with these . Would I have to do any routing or could I just slap em on and go?
"Don't gain the world and lose your soul, wisdom is better than silver and gold."
First off, what's your reasoning behind wanting to replace the tuners? There's nothing wrong with the gold ones that come with the J-200. You might even be lowering the quality of them by going with the set you chose at MF. Now if you want to upgrade, how about the gold Grovers that come with the SJ-200 Gibson? Just some food for thought.