if you are running 24lb injectors you need a maf calibrated for 24s.
You said it is running rich?
Look, a sentence here and snippet of info here ain't gonna get you good advice, just a bunch of educated guesses that will likely lead to wasted time and money.
#1 complete list of modifications
#2 a list of codes
#3 how did the car run before the mods
The last question is important because I've seen members come here with an ill running stang and they have thrown aftermarket parts at it because of random advice or internet suggestions.