Re: Camplugs - sounds like the crankcase built up pressure and popped what it could out ... I'd just put them back in ..
Re: tremendous oil smoke & running rough - sounds like you just need to let it run - I mean mostly at idle for a while - just in case .. and then
1) spray Seafoam Spray intake cleaner down the throttle body (while it's running.. don't overload it)
2) run a couple tanks with Seafoam motor treatment in the fuel
https://seafoamsales.com/auto/
(or use your favorite alternative to this)