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you want the water to go in through 1. to make this work, you will want the thermostat housing on the engine WITH the thermostat installed. you will also need to plug C/D. it would also be best if you clamp the big hose on the other side of the engine as well (goes to the radiators).
the idea is to isolate the engine itself from the radiators & heater bypasses. when you get it right, water forced into 1 will come out of 2/3 after having fully circulated through the block and heads. FYI you will need a VERY good seal, as the engine really holds a lot of water. not even sure a common garden hose will supply enough volume/pressure to shake any sediment loose.
if you have trouble sealing off a hose into 1, i think as a (slightly less effective) alternative, you could re-install the water pump & unclamp/remove the big hose from the other side of the engine. attatch a hose to the water pump (pumping into C/D in your diagram) & pump the water out the other side of the motor. you will miss some passages this way.......
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