so i have a set of old rod bearings so i can use those to check clearances and such to get the correct color bearings, but i dont have any old main bearings. I was planning to just go by the markings on the block/crank since there no major wear on the crank, but im seriously confused...

1. i dont see any lettering on the block to help the coding to use the chart?
2. The markings on the crank are as follows...(oil pump to flywheel)

c B 3
1 3 C 2 C 3

any input on what earings i might need? its really confuseing me