70mm or 75mm TB, which one for a stock engine?

[96_4.6]

Have some extra cash and i know I've always been told dont get a bigger throttle body on a stock engine unless you have one laying around or something but I'm 19 and I have a $10\hr cook job and will never see 3 grand for a blower or even 1 grand for a head swap cause i have have small amounts of money at certain points and it goes fast so i just want the smaller things, gears are next week i hope it wont be more then 400 with gears and install but i can do 200 for a bigger throttle body and whats up with the cold air intake, if i buy one before I get the throttle body will it still hook up to the bigger throttle body cause it comes made for the stock TB which is smaller, thanks for any input