Minarelli case lube holes

There are two types of minarelli case. I have them both. One has the lube holes to the crank bearings near the intake on both halfs and the other has them in the transfers on both halfs. Why is there so? The manufacturer must have changed the placement of the lube holes for a reason? And where will it be best to have that holes? please help me which case I should use for building up my engine. Any thoughts from you guys?

 

which is the newer design? ive not changed many main bearings in minerelli motors, so im not sure its really a problem with lubrication. ive only seen the ones with the transfer oilway.