727 Towed in Park

Hello All, Recently I had to tow my 74 duster with 3 speed 727 trans. When it broke down, It wouldn't roll, started fine, but couldn't get it into D. My assumption was it was stuck in Park. After looking at the shift cable (B&M) it was obvious that the headers had melted away the red sheathing and the cable was now non-functional. AAA took it away on a flatbed as towed/skidded it up onto the bed. When they "dropped" it off he used a rather aggressive technique of using the car's weight to slowly slide it down the ramp onto the parking lot with a series of short up and down thrusts on angle. Although this pissed me off, I didn't have any other way to pull it off. As soon as it landed, it now suddenly seemed to roll. Also, now it won't turn over. I'll get it up on some jack stands soon and manually push the linkage into park but does if it's already in park what happened ?? I have never tried to start it in N so perhaps it just found it's way into N and there is an interlock ? Thanks in advance.