Adding to what F.C. has advised; the 1993 Cinder Cone is Pre-Suspension corrected geometry. A Threadless Rigid Fork with a shorter Crown to Axle and Canti Bosses will be somewhat trickier to locate.
The bike was designed to give the correct Head Tube angle with a C-A of 390mm, which was the spec for the Project 2 that year - but it will be threaded. I believe that the Project 2 was not made in Threadless, 390mm, Canti. You could use a later pair of 410mm Suspension Corrected Project 2 forks that came in Threadless, but this will make the steering a little more sluggish - but no more labouring the the Rock Shox J3 currently on there.
Pip