You might want to check the brand of oil you are using. They all have different levels of volatility, some better than others. If the brand you are using has a high volatility, it will form vapor more readily when hot. Vapor can get fed into the combustion chamber and burned, and if it is mixed well, it may not produce smoke.
There may be a listing for your brand that you can compare to others. I think there is a site that has gathered some of that information together where you could compare.
The duratec has grommets around the cam cover bolts. As I understand, you cannot buy them separately, or at all. You might want to get an O-ring assortment from HF and pick out some that will seal your cover bolts. I don't think sealant on the threads will do the job as that would have been done at lower cost than grommets, maybe.
Check your grommets and see if they have hardened, and if so, seek some replacements that come close. As long as you use rings that are tight, it should not matter that they don't look exactly right. Figure out where the sealing takes place, side seal or top/bottom seal, and make sure that dimension fits well and forms a tight seal. The other direction should not matter as long as things stay in place properly.
tom

Put your finger in the exhaust pipe and if it's oily, that would explain it.

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I think you missed the post where he stated it uses one qt of oil per fuel stop That would be the mother of all volatility problems.

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Tom, thanks for the O-ring suggestion, seems logically like it should work and my years of heavy equipment mechanics I have a full assortment of them. Btw, the oil I am using is Royal Purple 5W20 but I can't answer the volatility question.

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I checked it but it looks the same as it has since I bought it new.

I noted the quart per tank consumption, but way back when, I had a 66 Tempest 326 that had the PCV disconnected when I bought it. I figured 'ignorant owners...'. NOt. After reconnecting the system, I drove from Indy to Athens, GA. Went through 6-8 quarts of oil, and never saw any smoke. How? Bad rings, I guess. Disconnect the PCV and oil use dropped. I did not bother poking around in the exhaust pipe, as I knew the oil was going somewhere, and it was not leaking... Where else??
I don't remember if it was 1qt per tank, it may have been more as I don't remember stopping 4-5 times for fuel, but do remember stopping to add oil. Could be the warning light came on, at speed, and I slowed down until it went off, and muddled along to the next rest area or exit. It was some time ago...
tom