Before you did all that, did you pull the plugs and squirt some oil into the cylinders? You can spin it by hand or with the starter. It should turn freely.
I would also pull the valve cover and see if all is well up there and it is getting oil. These engines with 6volt dont turn over fast like a more modern engine. Keep us advised.
Mark


1951 Chevy 3100
Some days you get the bear. Some days the bear gets you.