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Marco;
Welcome to the Forum!
Needing to pump brakes, but firm pedal after that suggests no air in system, so bleeding wont cure, but rear shoes needing adjustment...if adjustors are frozen as they typically are if the haven't been refurbed (alu housing/steel adjustment screw is very susceptible to galvanic corrosion), the only solution is removal of drum (ONLY using acceptable puller) then removal/replacement or refurbing of adjustor.
I suggest you get you brakes in order and performing the best the can with OE equipment...reason for needing high pedal force is that the Girling vacuum assist unit originally in place from the factory was likely removed (the ALL leaked) so you have no advantage from it...but many of us here have gotten used to this and it works acceptably. Installing a "larger master cylinder" wont do much...
See also: http://www.sw-em.com/service%20notes.htm#Braking%20System
A 150 HP B20 is doable, and would sure be fun, but why don't you get your brakes working right, then give it a proper tune and get used to it for a while before changing things...you might find that you can put this off for a while...
Cheers from Connecticut!
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