no thermostat is good that old./ ever.
and the hose does not get water coolant from thermostat until the engine is hot and thermostat is opens( begin to open)
you forgot to burp all air from the cooling loop.
you are doing all this wrong.
well the reservoir goes empty when you do it all wrong, get all air of the loop first. then fill reservoir 1/2full of 50a%AF (antifreeze)mix.
the thermosat not installed backwards and STAT bleed hole (jigglepin)
must be up hill. (so it can be burped)
once properly filled of coolant, any leaks are seen clear as day
hood up(not driven) and let engine warm fully up and like magic
all leaks are seen , if present. and from the exact spot , is what matters most. (you never said where, only below crank pulley)
sorry the crank is not water cooled. look again and look closer
let engine idle up to 30 min to find the leak.
other than hoses or water pump leaks.
here are all front engine leaks possible
yellow arrow
F= freeze/core plug, x2
up top is a leaking intake manifold gasket (common too)
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