Sorry dropped the ball - the valve I was thinking about was th e67
In any case I believe the hoses and valve were likely installed sine it would match the non AC installations (no no problem for the workers to handle the positioning of the hoses during engine installation and make it easier than after) and how they were done in the prior years. The clamp/retainer for the vacuum hoses above the heater was in place also and though the sealer didn't often reach that high on the firewall have seen plenty of hoses with some sealer on them
Couple of examples of non-Ac hoses with sealer on the top one (likely shadowed the one below) and one picture possibly showing what might be sealer on one of the heater hoses
Just what I've got currently