speedmaster 2.02 valve heads on a 318

Now the big question, i know that the 340, 360 passenger side block ears are in a different location, or somethings different about them compared to a 318. Now why in the hell would mopar do that. All the different bellhousings are bad enough.

What is different about them, and can i mod a 318 passenger side mount for a 360 block.