what should i do to my 96 cobra

I dunno what you have done to your car at this point, but 4.10 gears, LT headers, o/r midpipe, & a tune should put you near or over the 300rwhp mark, plus the gears will give you the low end punch that 4V's REALLY need...

As far as cams goes, I know that 96-98 Cobra's are supposed to have the best factory intake cams out of all the Mustang 4V's... Ford GT cams are a nice upgrade though.
 
Do not waste your times with cams. 4.6L cams cost a ton and offer very minimal gains.

Don't see or know your current mods, but go. CAI, L/T's, h-pipe, catback, 4.10's, MGW shifter, and a tune.

Don't waste your time with a throttle body either. They are good for 450-500RWHP. I've seen 96-98 and 99-01 Cobras lay down 530RWHP with stock throttle bodies.

IF you can afford a superchargers, that's the way to go. Make sure you have a good clutch before the install of a supercharger or L/T headers.