i had this trouble once and found that we could move the stuck engine by raising the left rear wheel and turning it back and forth, with the tranny in high gear. we needed to bump it hard in either direction, but eventually the motor turned enough to loosen all the clutch bolts. rocking the vehicle back and forth on the ground with the tranny in high gear might work also if you got some help and enough space.a little oil in the pistons with the plugs out will help this ,depending on what way the engine is stuck. good luck.
