Long block and short block as nothing to do with the way an engine sits in an engine bay. Please see below.
***Edit: Below was taken from a 10 second Google search***
Long Block Engines
If an engine was pulled directly out of a car with all the attachments, including wiring, it would be referred to as a long block. If purchasing a long block, it will be substantially more expensive than a short block.
Short Block Engine
A short block engine is also referred to as the engine core. This sub-assembly includes the cylinder block, pulley hub, front cover and engine plates. Essentially it is a stripped engine, typically what a mechanic would service when performing an overhaul.