Just how ridiculous would this be?

The next problem im facing is the motor mounts (or at least the one on the driver side so far) has a shorter gap inbetween the dog ears on the block. I read that some guys just use a spacer. Okay no problem, but the question that i have is that the distance between the rear of the front dog ear and the rear of the block on the magnum is 19 3/4" whereas the LA is 19". Is this going to pose a problem?

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The 340/360‘s had the same spacing. A 360 mount would bolt up, or use a spacer. People have been doing that for years when swapping a 360 in place of a 318.