Give it time Dark, give it time...
Considering I have first hand knowledge of how doggishly slow early 5.0s were (the continual 83 restore), and how the aftermarket for the push-rod is about 2,000 times larger than the 4.6, and considering that the parts cost about a 1/3 of corresponding parts on a 4.6, I think the modular motors are doing quite well....
Also, when did a stock 5.0 GT ever put out 260 hp to the flywheel?
oh yea, hehe, never....
Don't get me wrong, the 5.0 is one heck of a venerable engine that is easy to work on and relatively cheap to make fast, but give the 4.6 its due. Other than the original 96-98 intake debacle, these engines are pretty darn reliable, and make darn good power when modded....
To be honest, I love all stangs, but when someone with a "4.6s suck" attitude comes along, wheather they be in an LS1, 5.0, or a turbo 4, I'm usually the first one to hand him his rear-end at the track...