I have an 84 D50, 2.0 4 speed. I bought it not running and just pulled the valve cover. The head is very obviously newer than the motor/truck. I've worked on these before and I've seen both operable valve jets, and I've seen the plugs in place of the Jets. On this one, it has neither, and the cam rocker doesn't even have the extension you see coming off to run the valve jets. Has anyone experienced this before?

Sorry if some of my terminology is off, amature mechanic here.