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The front mount is called a horseshoe mount. See the link for info or search for horseshoe mount.
The bellhousing bolts to the crossmember. It’s like that right to 1972. The trans hangs off the bell.
Something you need to check is if the big hole in the bell is the same size as the input shaft bearing housing on the trans.
http://67-72chevytrucks.com/vboard/s...d.php?t=592845