Radiator Hoses-'65 273

My understanding of the lower hose debate is spring was used in the factory to aid in filling the cooling system. The process was to vacuum the cooling system down,wait to see if there are leaks then vacuum fill system.
I recently purchased an airlift cooling system filler. Its awesome.

Also, if your engine is running under correct cooling system pressure, its impossible for lower hose to collapse,unless your rad is severely blocked.