im unsure exactly what master cylinder i am currently running as its the same one that was on the car when i purchased it. however i dont think its factory.
its a twin cylinder master, ill be upgrading at a later date though as i don't think it will cut it.
Probably get a booster
still have rear drums, they will be fine ;)

I have the same brakes on my coupe, you wont be dissapointed! are you running a boosted master cylinder??