Use a slightly larger screw or "lag" bolt to screw into the broken tube.
Tighten until the broken tube turns, then twist and turn and pull with vice-grips.
I actually have a slide hammer and lag bolt specifically for that purpose, so I can leave the alternator in place.
Tap new one in using a 7/16 open/close wrench against the"flare".
Mr Gasket 6923: Oil Dipstick & Tube Chrysler 318-360 | JEGS
Good luck