If the compression test was good and its holding oil pressure, that's at least a good sign for the bottom end.
It looked like one of the plugs was carbon-ed up a lot. Even on modern vehicles, I will hook up a timing light and make sure each plug is firing correctly.
Those coil ignitions typically had a resistor on the coil, and often the resistor is missing leading to a coil thats running hotter than designed. If thats the case, the coil lifecycle is reduced to maybe two years max.
Also it is important to check the points to make sure the condenser is wired in. Points don't last long without a condensor.
If you see or hear play in the push rods, the lifters may be having issues. Old engine goo running through lifters is a headache. Does the oil run clear? It's odd that the valves aren't sitting right but it holds compression.
The van doesn't have points. It is an electronic ignition. I will put the head back together a d see if a new coil will help but that was a new coil.
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Ah, I didn't see enough wires coming out the bottom of the distributor to realize it was solid state. That, and the coil being new, it's probably not the issue. The only other thing i would check is the rotor cap, and make sure none of it is loose.
The only other thing i can think to check at this point is if there is a head gasket leak allowing coolant into the combustion chamber at idle. I had that happen once, and it does wobble the idle in a bad way.
To check it i fill with coolant and watch the fill opening for bubbles as someone throttles it up. I look for exhaust gas bubbling up through the coolant.
That's about all the easy diagnosis stuff i have that's simple and cheap. Best regards.
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