318 to 340 swap?

I just went through the archived tech info looking for info on whats needed for the swap. No luck, maybe I missed something. I was thinking of building my 340 in place of the stock 318 and wanted to know what might be needed for this? I think I read motor mounts? If so, where and what to get it for (application wise)??...thanks! (69 barracuda is the car in question)