I don't see why their will be a problem. My 440 is internally balanced, and so are 318's. if you look at jegs, or summit a 440 130 tooth internal balanced flywheel is the same for a 318 130 tooth internal balanced flywheel...so I don't seee any problems here.
if this flywheel wasn't neutral balance, it would have riped the bearings in the 318 apart.