Hey guys what's up I was looking at a 420a rebuilt bottom end and some of the options are as followed

Main Bearings - standard,25mm,50mm,full grove mains standard,full grove 25mm,full grove 50mm.

Rod Bearings - 25mm,50mm

My questions is which option is the best for the main bearings and the rod bearings because I don't know so any input would help me out a lot thnx.
EL