May apply to other FI Fleetwoods since the pump r&r is very similar.

There are two links with similar instructions, many pictures included in each. A Caprice or B-body LT1 vehicle is used in many pictures but the Fleetwood has an IDENTICLE setup, so all pictures apply to the D body.
http://www.badbodies.com/tech/fuelpumpinstall.htm

This article has specific info about the aftermarket Walbro pump but also covers standard fuel pump swaps as well:
http://www.badbodies.com/tech/walbro.htm