The frame mounts from a 73 A-body with a 400 will work on the birds as well, the mounts from a 73 A-body with a 455 wwill work also as long as you use the corasponding motor mounts. Both will work as long as long as you use the motor mounts for the same size engine. Right now I use the 400 mounts with my 455 in my 73 GTO. The difference in them is in the size of the motor mount which is longer in the 455 then the 400. But you can use either one & they will work.
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