360 questions

The ears on the drivers side of the 340/360 block are about 1/2" closer together than on the 273/318 block.

I ordered what I thought was a 360 mount for the drivers side of my 360 and it turned out to be for the 318. I just made up a spacer with a stack of washers to fill the gap on between the ear and the mount on the rear bolt. So, Yes, you can use your 318 mounts if you don't have any heart ache with using a longer bolt and a spacer.