Does this sound like valve seals to you?

[xtreme80]

1980 C10 with a crate 350.

If I let the truck sit for an hour or so, or after it's been sitting all night, then try to start it up, it blows a bunch of white smoke out the pipe. A couple of the plugs are covered in oil if I pull them out. I will get some white smoke while driving, but very little. It's mostly when I just start it up.

We did a compression test on it, and that comes up normal. When I had it in the chevy dealership under warranty, they told me it was the intake manifold gasket that was causing the oil to get sucked into the engine. I fixed this, and it's still doing it.

My only thoughts would be rings or valve seals, and if it was rings, I would think the compression test would show this, and it would puff more smoke while driving.

Thoughts?