M-code A-body question

HemiSSDart said
Yes the do, but they use the two projections on the side of the block, the A-Body big blocks have the second projection shaved off for the steering box, especially on power steering cars. Here is a picture of a factory 68 Dart GSS 440 block.

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I knew about the shaved off mounting provision, but again my 75 engine fits with that mount intact. Manual steering, but no M-codes had power steering so it still doesn’t really add up.