Professor..
You beat me to it.
In a nut shell, the clamp kits sold by Dales Cuda Shop, resold by Classic ind are sized for perhaps NOS hoses.
Some of the clamps do not fit readily available hoses of today.
Example... The radiator of small blocks have the same size tube for in and outlet. The thermostat and water pump are the same as radiator. Yet the kit supplies two different sizes for heater hoses. Two work, two leak like a sive.
I contacted Dales and he told me it was my reman cast iron water pump.
I have some of the bypass hose clamps extra still pm me and I can get you a couple.
