On the brakes, yes the 54 unit can be made to work in the 51 but you will have to transfer several items in addition to the booster. There is a procedure detailing the procedure to install the unit in an earlier car in a
service counselor article Note the units are not quite identical. The 54 unit is slightly different internally but functionally the same. It has a built in air vent instead of the remote item connected with a hose detailed in the 52 article so less work to install. The Easamatic as Packard called it is a Bendix Treadlevac used by several other manufacturers and you will read many different opinions on its reliability. After reading some you might give thought to keeping the manual system.
On the fuel pump, if the car has not been driven in many years the rubber in the pump will be old. Todays gasoline with alcohol does a quick job on the old rubber so you would be advised to get a rebuild kit or an exchange pump with new rubber before driving the car very much.
On the guides, new are readily available and several have done the job. Someone should be posting before too long to detail the procedure.
The 5452 is a Patrician sedan on the senior or longer 127wb chassis. Senior engine and running gear so many of the mechanical parts will not interchange with your smaller or junior chassis. Some but not all of the body items will interchange. Trim is different so while it might fit, it may not look the same.
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