You would be happiest if you just kept with the 4.0 you have in it now. If the engine is tired, look into getting one of the 4.0 based stroker engines for big power gains. It would keep things simple and you wouldn't have any cooling, fuel, exhaust, wiring changes at all...
On the steering wheel
5 1/2"
The stock horsepower of a 1987 AMC 360 engine, commonly found in the Grand Wagoneer, is approximately 175 horsepower. This engine is a 5.9-liter V8 that was designed for durability and torque rather than high horsepower output. It delivers a robust performance suited for the vehicle's off-road capabilities and towing capacity.
not from the factory
Yes. It will fit. You will need to do some conversion though. Go through a company like Novak Adaptors or Advanced Adaptors to get the engine side and transfer case sides of the adaptation taken care of. Then you will need a transmission controller.
according to the owners manual for my 1987 Grand Wagoneer, it holds 20.3 gallons
It is under the dash, on the driver side.
In a 1987 Jeep Wagoneer, the fuse box is typically located under the dashboard on the driver's side, near the steering column. You may need to remove a cover or panel to access it. Additionally, some models may have a secondary fuse box located in the engine compartment. Always refer to the owner's manual for exact locations and diagrams.
The small Cherokee based Wagoneer is a 5 on 4 1/2" and the Grand Wagoneer is a 6 on 5 1/2" bolt pattern...
Disarm a MIRROR?? Did you read what you're asking? This makes no sense.
if it is an automatic use ATF + 4
automatic transmissions are filled through the dipstick tube.