wont go in park

look here
My 69 has same problem, 70DartMike is telling you the solution I know of. I tried it once long ago and couldnt get it right. I couldnt figure exactly what "arm" and bolts they referred to. I decided to stop and finish replacing my carpet, it was too late to try again that day. I'll have to try this again some day.
Let me know how it goes. I can get in park but sometimes it takes work.

"Some Valiants (and other cars) will not start in Park, but can be started in Neutral. Bill Watson wrote that the shifter linkage might be out of adjustment:

The linkage from your steering column attaches to an "arm" that sticks out from the tranny on the driver's side. Get under the car while someone moves the gearshift linkage. Place the car in park, loosen the bolts to the "arm", push the arm all the way in the direction park is engaged. Then push your gear level all the over the left - as far into "P" as it will go. Then tighten everything up.

Or the problem could be the neutral safety switch, if it will not crank at all and the battery is good:

As for finding the neutral safety switich, there will be a small wire attached to your starter solenoid that leads down under the floor toward the transmission. Follow this wire. You will find the neutral safety switch at the other end of it.

"