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The 72 is a problem. GM did not make the 700R4 until 82. The 72 probably had a 350th tranny in it. The 700R4 is a few inches longer. That is one reason the holes did not align properly. If you used a 82 or later truck with a 700R4 then the bolt pattern will fit for any 82 and later truck. 73-81 trucks frames have to be drilled to fit the 700R4. I think even holes for the 350th tranny crossmember are already drilled in the frame in all the 82 and later trucks.
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