As a Pom I could object to that comment-however I won't since I am too old and well remember trying to keep old british bikes oil tight-and mostly failing. Conversly my 38 year old 450R/T Ducati is completely oil tight.As Steve says don't overtighten as they strip when old.
This puts you down the path of getting helicoils.
With nice gasket they dont leak or the screws come undone.
Unlike pommy bikes.
If your motor is a Monza, it's a 250 not a 200.
Torque settings are more a matter of application then of a specific model of an emgine. As I recall the head bolts on a Ducati 250 are m12 x 1.0 pitch and thread into aluminum. I have always used 28 lb ft taken down in three steps and always across diagonally with well greased threads.
Be gentle....fifty-year old metal.