you cant just replace the bearings! if its been knocking i would be 100% certain the crankshaft will need a grind have you measured the crankshaft?

the 1.25 engine dosent have timing marks. if you have painted your own then removed the pullies/ crankshaft pullie the marks will be made redundant. as they do not use woodruff keys they have a flat plate that locks into the back of the cams and a pin thats inserted into the crankshaft