Engine missing problems

[don-vee]

I have a Slant in my 80 Dodge van. It has been running fairly poorly since I bought it (the price was right), it seemed like the engine was missing on one cylinder. So, I did the ol' pull-one-plug-wire-at-a-time thing, and it turns out both #3 and #4 are sounding dead. The plugs are all firing properly, so I did a compression test, and all is within reason. I checked for any vacuum or manifold leaks, nothing. So, now I'm a little stumped, I'm thinking flattened cam lobes, or ??? Anyone have any other ideas?

 

[66aCUDA]

Pull the valve cover off and watch the valve train. Fire it up it really wont sling oil everywhere. Plan on valve adjustment as this could be a solid lifter engine. If not you could have a colapsed lifter. It may have a pushrod out of place.
Frank