?! NO Stuck Engine Thread There....
To free an engine that's been sitting , fill all the cylinders with
DIESEL FUEL let it soak for a week , topping up the cylinders that drain every couple days .
DO NOT use anything else than Diesel Fuel ! .
Once it's had time to soak , grab the crank pulley and
gently rock the engine back & forth , it'll prolly just barely move a tiny bit at first , this is fine , keep moving it back and forth untill it stops and NEVER force it past where it begins to get stiff .
Eventually you'll be able to rotate it 360° , so turn it 360° a couple times and then drain the now contaminated and ruined oil , re-fill with cheap thin oil and try the starter , lay a big old rag over the right side of the block as all manner of dirty , crsuty oil & Diesel fuel is going to spray out of the open spark plug holes and stain the garage wall

if you don't .
Now , you can adjust the valves and set timing , make it run .
As soon as it's warm , change the oil again and keep changing it every 50 miles or two hours of running untill the Diesel stink is gone ~ failure to do this or attempting to run the engine before you change the Diesel contaminated oil , will cause rapid bearing failure .
Oh yes , when you first fill the cylinders with Diesel , also squirt thin oil between the valve springs so it dribbles down the valve stems , this will prevent bent valves when you begin turning the engine next week .
Take your time , this works ! I've done it many times over .