Congratulations on getting it all done.
Is either the donor engine or the 300SE a California car?
My Texas 300SE has no vacuum lines as you described (I don't think).
It uses vacuum lines to control the vapor cannister, ignition, EGR, air pump, tranny, and brake booster. But nothing going to a thermal switch on the head or to the air intake.
One place you might look is in ************************. They have vacuum schematics for various cars with the parts identified.

DG