one owner Estate find, cant find a book value any help would be great

fuel pump, filter, throttle body modulator have been changed. previous symptom: high RPMs at starting. key starter switch sometimes failed-by-pass button installed directly to battery. with present problem stater will run but engine won't start using by-pass button.

when going up a hill it feel like a turtle . but when I hold the pedal down it take off like jet

I was wondering what gas mileage i
will have and the power I can expect. Plus the same thing if I were to lift it 3 inches and
go from 27's to 29's. Thank you

And is it possible to test speedometer cable from transfer case by turning the gear manually ? Also if there is no movement on the gauge how than can you determine if the cable or gauge is bad ?

I read that online somewhere. Is this true?

Replaced because of squealing by a friend. But they still squeak.

Failed the HC GPM. 3.7797 Limit 3.0000
Failed CO GPM 57.8648 Limit 25.0000
Before test I had spark plugs, spark plug wires, cap and rotor, new air filter, changed oil, and new oil filter.

My jeep is actually a 1987,I removed all the oil pan bolts but i cant get the pan free ,i tried to pry on one corner but it wont budge does anyone have an idea, it must have permatex on it.