The crankshafts are the same so the rod journals would match. I believe that all small block chevy rods were 5.7 " long , with the exception of the 400 which was 5.565(i think). Only difference was the old small journal vs the large journals.
Again I could be wrong but this is what I have always thought. I know the cranks are COMPATIBLE cause I have taken a 305 crank out and used it in a 350 with no issues( stock motor)