What were the original pickups in these guitars like?
^^ Yes, though I think Dry-Z was a couple of years after the op's guitar, intended for the 'as close as possible' Burst renditions. In the 70s, Greco had the U series humbuckers (U1000-4000), many of which were indeed PAFish and predecessors of the Dry-Z and others.
What were the original pickups in these guitars like?