Interesting video- - - - -Since the crankshaft turns twice for one turn of the distributor, there was nothing wrong with the distributor position or the firing order. The ball and pointer in the bell housing window will align twice- - - -once when the #1 cylinder is ready to fire, and one turn of the crankshaft later when it's time for #6. The distributor will only make half a turn during that time. That's why watching the movement of the rocker arms is absolutely essential.
Unless you're turning the crankshaft to the right position between each cylinder's valve adjustment, no wonder you're getting lots of clearance on some of the valves. The valve adjustment needs to wait for another phone call or a visit. Ditto for positioning the distributor in the block so we're sure the oil pump drive is engaged. "One step forward- - - - -two steps back" might be OK for country line dancing, but it makes getting an engine running just a bit difficult!
Jerry
