If your pedal goes down it's not the booster, the pedal will get really hard upon a faulty booster. Could be a leak, Those are common to leak at rear wheel cylinders. Or a faulty master. The teg master will work but may lead to too firm of a pedal because you don't have disc in rear. Master cyldiner from a 80s prelude with accompanied proportioning valve should be the best bet (disc front drum rear)
Also the only car worth aluminum drums was the hf if I remember right. I swapped in discs in the rear on mine, (don't wanna hear it Scott) [emoji23][emoji23]
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