I can't tell you specifically on that motor but usually there is one or more latches front and back may be under a door or hidden in the design.
58 is V410,V4S10 59 V4-11 V4S-11 understressed 50 hp at 4,000 rpm.
These are good Engines though very thirsty.they are usually refered to as heavy but actually lighter than todays 50s.Called fat 50s because of the shape.You should try to find yourself a factory service manual before attempting any work.
ok which seloc manual should i get. the ones i see do show my motor.