OK if what you mean is that you have two piece mounts an they are a little wider back at the fire wall than they are towards the front of the engine. If this is the case and the four engine lug bolts are all lined up and seated well then you are fine. Perhaps I would secure the mounts to the engine and set the assembly on a table firewall side of the mounts down and if they are not setting flat with a corner protruding a little you may want to file it a little so the assembly sets flat.

John