hi guys, just got my first Fiesta mk1 with 1.1 OHV engine.
want to use car for every day use and have some questions regarding how to make car more reliable for every day use.
have 2 things witch want to get in good shape
1) ignition/engine
2) brakes

Regarding brakes:
i have R13 wheels and want to leave them, so i want brake upgrade but so they fit under those wheels.
i need to put servo from early mondeo ( witch year) and brakes from newer fiesta?? witch model can any one tell??

ignition and engine
how reliable are those 1.1 OHV engines iam thinking what could be the best option to put engine from mk2 mk3 mk4 ( dont want big engine, want reliable easy to drive and economic engine some 1,4 or 1,6) or just to change ignition ( to put on electronic) to this engine different carbs and job done?

thank you guys for help