Why turn the engine with the starter motor? To do a leak-down test you are going to have to pull the crank cover on the right side anyway. Remove the crank cover, pull the plugs, use a big wrench on the crank (at the pickup rotor) and rotate the engine by hand. Listen and feel. The engine should rotate smoothly with no mechanical noises like clicks, ticks or dings. If it passes this basic test do the leak-down test. A cold engine will have a slightly higher leak-down and lower compression than a warm engine. If the engine passes the leak-down test I would consider a compression test not necessary.
Ok, let's say you have your engine sitting on the floor. Dr Frankenstein has a car battery nearby, a set of starter/booster cables hooked to the FJR engine's starter solenoid, the battery and a $10 Ford starter button set to go. With thunder in the background and lightning flickering around the garage Dr Frankenstein chortles to himself and pushes THE BUTTON to bring it to life. Electrons rush to the starter relay (activated by the $10 Ford button). The starter relay slams home the shorting bar allowing the rampaging electrons to flood into the starter motor. The starter clutch instantly engages, spins the starter gears which turn the stator shaft. The stator shaft is the crank on the other side of the engine. This instantly imparts rotational forces trying to move large masses of metal. The rotational force causes movement creating a strong reactionary force in one direction when the reciprocating assembly and engine clutch plates resist instant acceleration as the starter gears apply torque to the crank shaft. Quicker'n you can say OH CRAP the engine rocks over onto it's side and the only thing that prevents it from doing a propeller imitation on the clutch cover is the battery cables being ripped off the engine. The battery cables will almost certainly come off, the question is if they will stay connected to the battery long enough to whip the battery around the garage too.
Or not, it's just a thought.
The other thing you won't be able to check for is popping out of second gear.
Considering the year of the engine, you may want to do a preemptive clutch soak.