There are two bottom bolts.
Take off the pan that might be under the clutch housing (screws can be reached with a screwdriver through holes in the frame cross-member).
There are two transmission bolts from the lower inside of the clutch housing.
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Transmission Removal - steps 9-11
http://chevy.oldcarmanualproject.com/shop/1955truck2/55ctsm0751.htm
