A lot of high temp paint will only cure if brought up to temperature.
Shutting off early may have prevented that, so fire it up again and let it run and get hot.
It looks far worse than it really is.
Also everything else related to the engine will also be burning off, any oil protectorate left inside the exhaust pipes will also burn off, etc.
Some first time fire ups can be quite a smoke show but harmless, it will burn off and then your car will be fine.
It is normal the first time out.
Al
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