Soooooo.
It was not the hose, but the press in fitting.
Plan:
Remove belt, pulleys, and take out water pump.
Remove press fittings and do NPT tap with hose barb ends.
1/2x14NPT and 3/8x18NPT taps
Edelbrock 8183 and 8187 fittings.
Oh the joy. Very weird place to fail. Better now than on the...