The stock sub is fine, IF you do something to create more negative camber gain - either the Guldstrand mod (which lowers the UCA mounting point) or ATS tall spindles or tall ball joints which (relatively speaking) have the same effect as lowering the UCA mounting point.
I'd pass on the rack and go instead for a good box - depending on budget either a 3rd gen IROC box or one of the Lee or DSE boxes.
And I wouldn't install the rear sway bar until you decide you need it.
Oh, and thank you for your service.
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Mike - '68 Camaro with some stuff done to it
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