Re: main bearings
If there isnt any damage to the rod or crank, then standard size bearings wont require any machine work. If there is damage then you can replace the damaged rods/crank and stay standard sized, or you will need to have the parts machined to match the oversized bearings.
ACL is a good brand but I dont know what intervals they offer them in. If you need machine work, the shop could tell you exactly what youd need depending on the condition.