It looks like two of the Cub rod bearings will fit side by side in the Chevy rod, with a groove left between them for oil flow from the dipper hole in the rod cap as it goes through the trough in the oil pan at the bottom of each stroke. I'll add permanently-mounted brass thrust washers to both sides of the rod caps to keep the rods centered on the crank journals. "Standard" Cub rod bearings are the same diameter as the original 4 cylinder Chevy crankshaft, with 10 , 20, and 30 undersizes available. The two sets of Farmall Cub rod bearings needed to do the job will cost just under $100.00. Compare that to the cost of getting somebody to re-pour the rods, if anybody will even attempt to do that anymore!
Now on to the next project- - - -main bearings!
Jerry
