there are three or four different computers for 5 speed 89-93 can't remember the damn numbers off the top of my head, i know the a9p is for auto's...try doing a search
There are several mass air computers depending on the year and tranny of your stang. A9L are for fox (89-93) 5spd's, A9P is for the fox auto, T4M0 is for 94-95 5spd's, J4J1 are for 94-95 Cobras, W4H0 is for 94-95 auto, there is a ZA0 for the 95 Cobra R (351). I don't know what it is but I'm sure there is a computer for the 93 Cobra. Hope this helps!
i did the conversion with an A9M and the car pulls like mad on the bottem i also have an a9l and it runs well with it just doesnt pull like it does w/ the a9m