smoking sebring

[SmokeyD]

96 chrysler sebring coupe
mitsubishi 2.0 4 banger
auto trans
148000 miles

I recently purchased this car and replaced the short block with a used short block. After getting it all back together, it runs, with a couple of issues:

1.Diagnostics show insufficient flow to EGR valve and misfire on cylinder four. The check engine light is constantly on but if it idles for a few minutes, the check engine light will start flashing.

2. It smokes. THe smoke seems to be the blue haze type that is associated with burned oil. I can't figure out what exactly is causing this issue. Valves or rings or...something else?
I have put about 500 miles on it and the sum bitch runs like a raped ape. Seemingly great compression, fuel delivery, etc. I did check the spark plugs today to see if any oil is present and found they all looked clean with no hint of oil.
I did put a quart and a half of oil in it this morning but this could be contributed to it's relatively new assembly.

What is the cheapest, yet effective way to find out what is causing this smoke? What tests can I do to narrow this issue down? Any advice appreciated.