A camaro is a larger car though, so maybe there is a chance that it will beat it because of that? I think the reason Ford never put the 5.4 in a regular mustang was simply there was no reason. My mom's 4.6 powered T-Bird has unbelievable amounts of tourque (more than anything else I've driven). Note that mustangs run (comprably equipped) about 4-5 thousand less than a Comaro or Firebird. How often do you get to stomp on it on the road anyway? It's more image in selling cars these days than actual performance numbers. (Note: Ricers). And in order to sell them they must also be affordable, hence the reason the mustang is still in production. They sell more v6 convertables than anything else anyway.

The I6 I believe was around for at least 40 years, why don't you consider it one of the best engines in production? (they still use it for generators and water pumps etc.)