New Engine Help (Please)!

[nonstop]

Good evening everyone!

I am hoping you can help me with an oil issue. I just finished building my 383 for an OT car (Firebird). I fired it up today and ran it at 2000 rpm for 20 minutes. Everything went well with that. As I was bringing the rpms down, it started blowing blue smoke out the tail pipes. I messed with it for a bit, but it still is smoking. It smokes more when you goose it. Rather than a long description, here's what I've got:

PCV oily, still smokes when disconnected
RPMs increase when PCV valve is disconnected
Compression test showed 160-170 in all
All spark plugs are oily
Doesn't smoke on start up, but about 30 seconds into running
Heads were reused, but checked by shop and given the green light. It didn't smoke before the rebuild.

The block was decked. When I assembled the engine, the heads did not have dowels, but the head bolts held everything pretty well lined up (doubt this is an issue, just throwing it out there in case). The heads have new positive valve seals.

Would I be on the right track to assume this is likely a common area problem since all spark plugs are oily? Would it be safe to assume I'm sucking oil through the intake gaskets, or am I missing something?

Please help me with this one!

Thanks for any suggestions or guidance,

Nick