19's & the stock pump is too small for what you wanna do if you do it
right.
You
may can get by with the stock stuff for
a while with elevated fuel pressures.
You don't give any long term goals so I say at least 24's and a 190 pump.
If you are gonna go for a max na effort, (tune needed) you may want to consider 30's and the larger 255 pump. I'd do the 255 pump no matter what.
For a maf, I usually say the best bang for the buck is the ProM 80mm.
however
Lately, some have had good things to say about Granatelli mafs.
Some have had good results from the
latest offereings of mafs from C&L.
I don't think I would be as comfortable with an older used C&L maf.
Don't spend money on a ProM caled for 19's as that inj is too small for your needs anyway.
I'm not gonna say a used fox maf won't work for you!
but
The transfer curve for the fox is some what different than our cars
and
since you don't have any way of making adjustments to its curve
A used 24lb caled maf for 94-95 Stangs will most likely give you better results.
btw ... DON'T buy a used maf from a Cobra guy!
It will NOT work
correctly for your GT!
All of the above info is based upon you trying to get larger inj's & maf to work together in the best possible way
without a custom tune.
Grady