Perhaps you would be interested in giving them a plug. They only have white ones left now, because the cars have been the biggest sellers they have ever made. The quality is exceptional. I know there would be many owners of 1960-62 Valiants that would be interested but wouldn't hear about it. The Australian S Series is also going to be released soon.
Most paint has too strong of a thinner in it and attacks the plastic.
I used to use a plasticote scratch filling primer. This stuff was the ONLY thing that did not destroy the plastic. Once the body is primed you can use regular sray can paint over it. Be very careful as if you build up the top coat too heavily it will eat through the primer with bad results. I use spay cans and have done so for many years.