The The LB block was the first major departure from the first generation. There are no ports for water pumps in the block. There are just ports for inlet where the engine mounts bolt on and form the inlet stub as part of the mount. The crank journals were set up to be replaceable. They made the first venting for the block at the oil pan rail. There is a lot of difference from 59 series and 8BA. These are desired for restorers of 35 and 36 cars or even earlier since they were the last pump in head block. One other thing to add. The mains were changed in 1935 so as not to have the bolt that went all the way through from the valve chamber.
You might scope out this thread since it has photos. It's the Official Ford Barn ID thread.
https://www.fordbarn.com/forum/showt...5301&showall=1