Crate motor usually means it has been internally modified to gain extra power
In this case a Ford 302 block
But its still considered a 302 engine
But general meaning for a Crate Engine is that the engine didn't come with a vehicle attached to it, lol, and has never been in a vehicle
It's a new engine that is shipped, "in a crate", to the end user to install in a vehicle of their choice
So you could get a stock 302 engine specific to a year and/or model, no extras
A rebuilt or re-manufactured engine is shipped the same way, in a crate, but is not a "crate engine" because it was already used in a vehicle in the past