So, your pump has seized and ceased to function...been there, done
that.

Search the web for "bolt extractor".  Studs are basically headless
bolts screwed into the block

Use some penetrating oil on the broken stud while you're out at the
local parts store getting the extractor.

Replacement...take the two broken pieces and hit the stores again (get
a high grade one)....maybe the local Ford dealers have them in stock.

To install it,  thread two nuts on the stud,  lock them together, and
use that to install it in the block.  Don't forget the threadlocker.

Hava Goodun

DP
Pics of the cars:
http://tinyurl.com/4fcsn

Get a tool called an 'Ez-out' -- size it for the diameter of the bolt
you are extracting. This will take good skill with a drill, lots of
patience, penetrating oil, and some luck -- uh, make that a lot of luck.

Basically you make a drill hole down the center of the sheared off bolt
(extremely carefully because you get exactly one shot at this), then you
screw a reverse threaded gizmo into the hole. Next, (if we all join
hands and believe in fairies) the sheared bolt will come out before the
reverse threaded gizmo breaks, plugging up the hole and really pissing
off the dude at the machine shop that you take it to next. :)

Good luck!

Steve

because of how the bolt was damaged, meaning it was sheared off instead
of being twisted off due to corrosion, etc there is a pretty good chance
you can hook this bolt with a sharp center punch or chisel to spin it
out. if you have a decent small center punch sharpen it to about the
point you would get on a pencil. put a center punch prick on the outside
face of the bolt but NOT so hard or far out toward the edge that it will
roll the thread over thus locking the threads. then you get the center
punch mark in softly tap the punch with a hammer while you start to lay
the punch over on it's side to basically "spin" the bolt out. it you did
the punch mark on the top of the bolt you will lay over the top of the
punch towards the right and it it goes well, and i have had this work
many, many times, you will have to follow the bolt as it spins CCW by
moving the punch in a circular motion. it will be pretty obvious as it
happens if you luck out. you can also the corner of a small, sharp
chisel to do the same thing along with a pin punch with the flat ground
on an angle. my digital camera in in bakersfield else i'd send a photo
over demonstrating.