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!

I understand the early A's were smaller and lighter but remember it's not a sedan, it's a wagon. I also don't believe much about factory weights published about cars because they are generally off by 200-300 hundred lbs. My 68 Cuda FB is a v8, auto, 8-3/4 car with PS being the only option. I haven't added anything that makes it weigh more except subframe connectors that weighes 14 lbs. and a stereo system that added about 20 lbs. of weight and I weighed it at 2 different places and both said 3440 with a half tank of gas. Every place on the net I've read factory published weights on a 68 Cuda FB said 3,000~3,200 lbs. which is way off. JMHO