OK, my super 292 is almost ready to go into the car.  I have a couple minor missing pieces.  Where the heater hoses connect at the water pump and the intake manifold I have two 3/8 pipe threads.  I need a plumbing fitting that is 3/8 male to ?? male hose barb.   So what's the heater hose ID?  I have looked for this fitting in the restorers catalogs and find nothing so I expect I will get it from the plumbing store.

Also, need a similar if not exactly the same fitting for my vacuum booster hose.

I could go out to the garage and pull a heater hose off the existing fitting and spill anti-freeze all over the floor, but you guys are terrific at coming up with the answer while I sit here reading.