my old t5 in my fox would grind going into second with shifting hard, when the car was cold. once the car heated up, the situation improved. the other problem is the throw-out bearing as described above.
if you're not going to go nuts, just by a world class t5, with a centerforce clutch, billet clutch quadrant, new throw out bearing, firewall adjuster, and a new ford stock clutch cable. if you plan on drag racing the car much, or going over 300hp, then upgrade the tranny to a tremec