1965 Valiant 200 convertible (minor project)

The block date code indicates it's a '80 model, as well as the 0225, if that is what is stamped on top of the block surface behind the coil bracket. I'd pull the valve cover and replace the PCV grommet if it's hard. That way you can also see if it's a hydraulic cam or solid cam. If solid (has rocker adjusters), I'd check and/or adjust them as necessary.