Hmm..... you can use any cam designed for the 3.8L, the size of the motor didnt change, just different parts, like the tranny and such. So any cam made for the L36 should fit you engine no problems. Just make sure that you upgrade your valvetrain since you are a Series I engine. Did you actually type out NOS? ...... I can admit I am a closet ricer but ugh... Anyways a Zex kit would work well on the car just be careful, set it up correctly and find someone who has done an install before if you have never played with Nitrous before.
ADTR 1999 Black Bonneville SE
2003.5 Yellow Mazdaspeed Protege
2003 Azure Blue Mach 1 Mustang