I am not a comp cams fan, and Id stick a Crower solid roller in it in a minute for more "area under the curve" so to speak, BUT:
I would not change a thing until I got it in the car and broke it in then the next money I spent would probably be for a day on the chassis dynamometer. If it churned out 470 HP on its first and only pull, it may very well have your 500HP in it with a bit of tuning.
I imagine 460ftlbs will really get your attention in a car as light as a Cobra too.
The Blue Thunder is an EXCELLENT piece; it is arguably the best manifold out there for a street FE. The 3310 is not as bad as it is being made out to be either, and you can convert it to a secondary metering block with replaceable jets if you find it helpful in the tuning.
JMHO
