They could make more power with a 2-cylinder if they tried hard enough, and there are plenty of V6TT's that are no quicker/faster, nor fuel efficient than a 5.0 V8. Hardly a reason to want in a car as impractical as a Mustang.
Since we are talking about overall packaging, easily.
Speaking of 3.8 TTV8 engines, McLaren's M838T has a 108mm bore spacing vs the Coyote's 100mm which will increase the engine block length by 32mm not taking anything else into account.
A turbo V8 would take up much more room than a naturally aspirated engine, regardless of displacement. Look at the 4.0 BMW S65 V8 vs the 5.0 Coyote(about the same) then look at the 6.2-7.0 GM LS engines(much smaller externally). Benz has the M178 4.0 hot-V twin turbo V8 which is about the...
The day I brought it home.
Lowered and some new tires.
Ran the Texas Mile back in October 2011. Car was essentially stock with little more than a CAI/Tune and catback exhaust. 3.73 gears ended up limiting my top speed.
Hit 154.0mph.
Now have a Boss 302 intake manifold and...