What would a 94 mustang gt auto with 4:10's,t loc,shift kit,magnaflow exhaust,x pipe,cold air intake and pulleys run in the 1/4 mile?
High 14's?,mid 14's?,low 14's?

Also would it be faster than the following(all cars being stock)
95 z28
01 gt
04 mazda rx8
01 spyder gt
02 celica gts
98 F150 v-8

you're probably looking at low15's-high14's. That auto tranny is what hurts you the most...shift kit or not. As for your competition...

95 z28 - no
01 gt - no
04 mazda rx8 - no, yes if it didn't peel
01 spyder gt - maybe, close race
02 celica gts - yes
98 F150 v-8 - close race, dunno

I thought 94-98 mustang gt's run low 15's high 14's stock.Don't a stock 5 speed run high 14's and a stock auto run low 15's?

Nope, a 5-spd runs a low 15. The auto runs about a 15.6-15.8.