if you are running a 383 that "is built to take nitrous" I would think that the intake/tb is in pretty good shape.
Id go do a full suspension/brake upgrade. Get rid of the torque arm and get an adjustable one, suggested to get one that relocates it to a tunnel mounted version.
LCA's with relocation brackets, to go with the lower ride hight. And with that you will need an adjustable panhard bar.
As for what exactly you should buy, Id look into what you want to do with the car. Drag car? handilng machine? or just a powerful street car that will see some track.
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2/20/2013: They Day the ****s Stopped
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