318 to 360 what do I need to change?

You certainly don't need to spend money like that on motor mounts if you already have a 318. You can use the 318 mounts on the 360, you will just have to make up a 1/2" spacer from flat washers to go between the rear ear on the drivers side of the block and the mount bracket. Or track down a 340/360 factory drivers side bracket.

Othere than it the 360 will be a direct bolt in. Other things to consider are a beefier tranny, you likely have a 7.25 rear end so an 8.25 or 8.75 will stand up to more abuse and higher capacity radiaotr may be needed.