Magnum 318 questions.

What is the little hose called that goes from the water pump to the intake?

New heads on the way and ready to order all the stuff to put pops truck back on the road.

I plan on doing

New cap and rotor.
Plug wires
Head gaskets
Intake gaskets.
Throttle body gasket
Thermostat and gasket

What am I missing?

Injector O rings?

Also this is a very budget project so let's keep that in mind.

I dont want to do this over and want to make sure I replace all the stuff that will be buried after assembling.

If your going to replace the O rings use brake fluid cleaner instead of the usual carb cleaner. Those o rings will swell up like a donut with the carb cleaner. Ask me how I know!
Also, blast the IAC with some cleaner