Strong smoke generation after head seal change

Hello I changed the head gasket with my MX5 Bj 92 US Model 150000km due to a slight oil loss. I also let the head plan and made the valve shaft seals and head screws new. After about 2 weeks and 300 km the engine squirts extremely and after the smell it burns oil.The engine has power and does not rattle. Can help me with this problem. In advance already many thanks. Greeting Markus