Pentosin source...........

[Frederick Smith]

The device you removed sounds like the vacuum pump. It's driven
off the camshaft by a spring loaded rod.  Not smething you
can damage easily.

 Rotate the motor 'till you have the low spot on the
cam towards the hole where the rod enters the head. (use the rod to 
measure the depth, when the rod protrudes from the block the least, 
that's the low spot). Makes it easier to reinstall the pump, since you
aren't working against the full spring tension.

The ISV is to the rear of the valve cover, probably held in place
by a loop on the Valve cover breather hose. 4 inches long, 1 1/2 in.
diameter. Small electrical connector on the drives end, hose on the 
other (passenger) end.