318 to 340 swap

I've read a couple little things here and there but never gotten a straight answer. I have a dart sport 318 and I want to drop in the 340 that I have. What all do I need to do to drop in the 340? I heard all I have to do is change the driver's side engine mount. Is this correct? And what's the best one to get? Any other tips or advice would be great! Thanks guys!