273 valve adjustment???

That wagon is a 65 which makes it an early A body. They were much lighter and smaller. Here's a couple links:

http://auto.howstuffworks.com/1963-1966-plymouth-valiant-signet.htm/printable
http://www.uniquecarsandparts.com.au/valiant_ap6_technical_specifications.htm

Makes me feel like getting one and hot rodding it....the sleeper from hell!