360 conecting rod play

I finally tore into my 360 that started making a bottom end noise. I pulled the pan and rocked the crank back and forth with the balancer bolt. I can see and feel play in the connecting rod bearings. I pulled one and it has a little gouging but nothing too severe. I had swapped out the pistons and changed the bearings at that time(about 6 months before the noise started). Is it possible I put the wrong size in. How would I determine the right size bearing to be running? My bearings are stamped with a .010 This engine was rebuilt at one of the mass engine suppliers so I know it was rebuilt but not sure how much the crank was turned down. Is there any crank rod bearing journal sizes that will determine what size bearings should be in there?