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So will it be solid if its not drilled for the pilot bushing?



All cranks are drilled to allow the nose of a torque convertor to fit into the end, but not all cranks are drilled deep enough to allow the input shaft of a manual transmission to fit. If not drilled deep enough, some people remove 3/4" of the input shaft, use the late model roller bearing, and call it good.

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And any idea what it would run at a machine shop to get the 318 flywheel balanced for a 360. And would they know where and how much weight to add, is there anywere online that has the specs. A machine shop or a tranny shop?



There is a diagram floating around (you could probably Google it) which has the measurements of how to do just this. A 1-13/16" drill bit is required, IIRC. Might be easier to buy a 360 flywheel.

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Last, would the clutch and flywheel for a 318 be the same size for a 360?



They can both use the 10-1/2" clutch.

Here's a pic of the roller bearing sitting in the TC register in the back of my '77 360 crank:




The end of the crank with the flexplate still in place:




In the above pic you can see the smaller diameter bore hole, into which the brass bushing fits. If your crank is drilled deep enough, you can use either the brass bushing or the bearing which fits in the TC register.


Here are the flywheel and late model bearing in place:




Pic of the front face of a Mopar Performance 360 flywheel: