98 cobra swap to 99+ heads and intake

has anyone out there swapped 99+ heads and intake on their 96-98 cobra. i'm considering this cause i've read that the 99+ heads and intake flow much better. is there much horsepower and torque to be gained? and is this a complicated swap? i'm looking at used 99+ heads and intake relatively cheap and i thought about having them worked a bit. i'm still considering the supercharger but i'm not ready to drop 6,000 on that quite yet.

prob not worth the price of the install. i'm looking at a used vortech v2 sq with an aftercooler and if it works out i shouldn't need any more mods for hp but for traction issues.