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CI/Liters is the engine displacement, doesn't dictate the physical dimensions of the engine. Displacement is all about BorexStroke.
The thing (I THINK) that makes the 4.6 so much wider than a Windsor 5.0 (which is it's marketing name despite it being rounded to 4.9L), is the degree of the cylinder banks. I know the 5.0 is 90 degrees, but I don't remember the 4.6 mod's measurements.
Also, all 5.0s are 302 cubic inches, so every single one is rounded down to 4.9 liter displacement. The only difference is the older ones are Windsors and the new ones are in the Modular family, also called the 5.0 Coyote.
Mods are 90 degree as well, what makes them big is they are OHC (either single or dual)
Technically the old ones are a 4.9, but if you go around asking for parts you are going to get sick of nothing fitting because you are going to get stuff for a 300 I6. Might as well call it a 5.0 like the rest of the world.
The new Coyote 5.0 is a honest 5.0 at 4951cc compared to the old 4.9/5.0/whatever you want too call V8 and its 4942cc.