Hi Danny,
I am sure the car "aces" will respond soon, but my input is to not worry about adding oil with your car on the ramp induced incline. The motor has to work going up hills anyway, right?
One perhaps could argue that since the filter has not yet been charged with oil , the oil level will be artificially high in the pan, but this is true anyway and the new filter will fill very rapidly once the motor is started, ie, a few second after starting your rig, your car engine thinks all is fine and its just going up a hill.
Regarding use of a car jack, the car has jacking points on the frame rails under the car (at least my 95 does). It is important to use these locations to avoid potential damage to the underside of your car. I would advise having your Ford dealer point these out to you if you are not sure.
Good Luck
Jab