If it is the Plymouth, it won't be easy since that is a 4 door and the only kits I've seen from one even close to that era are two door models (and I think they are 4 to 5 years too new). Still, if there is an equivalent wheelbase chassis out there which can be used, then somebody may have done a resin body for one. But those early to mid-1960s Chrysler products aren't exactly popular model subjects, possibly due to all the weird curves on the bodies.