'71 Power Brake Booster Check Valve (and thermal sensor)

AFAIK, no vacuum line on any A-body from 1967 to 1980 ever had a clamp on it, NOR were they covered in a mesh thingy. Vacuum lines for the booster and the PCV are thickwall offerings to withstand the vacuum. Fuel lines will collapse especially as the heat comes up. Vacuum lines are all slip-ons. They stay on, even if the engine suffers a back-fire, usually.