Rob,
As the LA318 is balanced differently than the LA360, it is my
understanding that, in order to use the hydraulic clutch A/LA318
flywheel on an LA360, you'll have to have it drilled to properly
balance it with the engine. I'm not sure if there are any after-
market flywheels out there that'll work for your application. You
might try to post some questions on this topic to see if someone
who has done this before can assist.
John