Water Pump to Intake Manifold Connection
Looks like a Magnum manifold and LA front cover and water pump?
Regardless, get a 45* NPT (3/4", I believe)x 1"barb fitting and install it in the manifold with the barb oriented towards the water pump fitting.
Then get a standard '70 & up 1" bypass hose and install it; you may have to trim it to fit.