How were the A bodies put together down the assembly line?

That is a very comprehensive and accurate article by Mr. David Patik. I'm going to reread it.
My desk, when I worked on floor was directly across from the guy separating the broadcast sheets, at the beginning of the "motor station". He would give me a heads-up sometimes that some rare engines would be run.

The broadcast sheet was taped to the engine "buck" and the engine hoist man loaded each buck. Very little assembly or disassembly took place at this station. Then it went to another "engine loop" or station some distance away by conveyor for the transmission and to dress the engine with accessories. If we missed loading a buck we had to put the engine in a 4 place rack and get the hi-lo driver to haul *** to the transmission install station. There we used that much smaller 2 way hoist to load the engine onto the buck. Otherwise, a vehicle with no engine would be pushed off the final line to a repair hole and all hell was coming down if more than one miss.