If anyone wants/needs these parts they are yours for the taking.  I cut the cowl duct off the heater box as it won't work with my project.  The passenger side vent assembly is there and operable.  1980 Pinto.  The heater core is available too.  It looks good but appears to be original.  I flushed in both directions and it was pretty clean coming out after the old antifreeze was flushed out.  No chunks or anything.