Thanks for all the replies.
I decided to do some prep work this weekend and start the install in two weeks. I got the the vacuum pump installed, the alternator belt idler pulley V1.0 installed, a "new" (never installed) 1994 Kesley-Hayes hydraulic trailer brake controller installed, and I am working on the gauges now. Anyone have a 1991 alternator bracket forsale? I want to make idler pulley bracket V2.0. I need the vertical piece that bolts to the water pump.
One more question
Since the part is going on my 1991, is this a diesel question?
There is 1998 F150 SC Lariet in the salvage yard, any ideas where the keyless entry module is hidden? I looked through the cab, but could not find it.