That #001 car of Jeff's was actually a body in white that was used as the prototype car for the cut. Jeff took a 5.0 'Stang and used parts from it to get that car on the road. Jeff posts here occasionally as SWB001.
Dave's car #003 was made from 2 SC's. I'll have to look it up, but the #002 may have been a 90 SC. That car was sent to Kenny Brown to be shortened. It was raced with the 3.8 and later with a 351W. Finally, it was wrecked! My number #005 is an 89.
Basically, they were made from either wrecked cars that Doug Kielian (Auto Kraft) picked up or customer cars that were sent to him for mods.