Thanks Herman, im from Sint-Laureins, between Gent and Brugge on the dutch border. Thanks for all the replies already guys, if i understand correctly it would be better to search a 2.4 block, porting, camshaft, valves and a full exhaust together with a set of 45 on it? Im far more familiar with electronical injection then I'm with carbs but I think carbs fit such a car nicer and it gives me the chance to learn more about them.
As for the MOT, I could keep my 2L block stock and swap it every 2 years, but as you guys mentionted it might not be necesary as the 2.4 and the 2.0 look the same.
Sadly enough I dont have a deep enough pocket to afford a 16V head of Cosworth, but what I might try is shortening a 24V 6 Cylinder head If i can get my hands on a cheap one, welding it and modify everything that should be done with it.