The Aviator is essentially the same longblock as the Marauder and the Mach I. The big difference is the intake manifold.
While the Aviator is rated at 302 hp @ 5,750 rpm and 300 ft./lbs. @ 3,250 rpm,
the Marauder has 302 hp @ 5,750 rpm and 318 ft./lbs. @ 4,300 rpm and the Mach I puts out 305 hp @ 5800 RPM and 320 ft./lbs. @ 4200 RPM.
For comparison, the '02 Cobra is rated at 320 hp @ 6,000 rpm and 317 lb./ft. @ 4,750 rpm.
The primary differences in these engines is intake and exhaust. Note that, while the nte torque figure is lower for the Aviator, it comes on at 3,250 rpm vs. 4,200-4740 for the others.
The Aviator manifold is essentially a poor man's FR500 intake. The Aviator 4.6 L uses an aluminum intake manifold with variable runner lengths. The Aviator intake manifold is similar in design to the Ford Mustang FR500 intake manifold sold through FRPP for $3000 though the material (magnesium), runner lengths, and throttle bodies differ.
A lot fo Cobra guys are taking the Aviator intake and modifying the lid to lower the profile and accept the Cobra throttle body. I've seen unsubstantiated claims of 500hp with this manifold.
As you can see, the Aviator is much taller than the Cobra.
Compare the FR500 on the left with the Aviator on the Right.
If you can find a way to control the short runner butterflies and deal wit the height, this manifold has the potential for stump-pulling torque and not running out of breath on the top end.
If the height is an issue, another alternative is the late Continental dual runner manifold. While there are no butterflies in the secondaries it should have a pretty broad power band. I'd like to see some results for a ported version of this puppy.