273 318 340 and 360 all pretty much the same size like said may have a different weighted balancer on the front or back and possibly the driver side l motor mount may need a little different set up for the 360 maybe, but I'm sure there others will chime in. it's not even worth thinking about if you got a 340 to put in there to replace a 318 any small thing you may have to do would be well worth it.