Am I missing an Alternator Bottom Bracket?

[Gregski]

a little help please I have a '74 GMC 1500 350 4spd 1/2 ton 2 WD

when fandangling with my alternator in order to do an intake manifold swap I noticed that the long 6 inch bolt had too many washers on it - hmmm I thought that's odd

today I ask Manuel what he thought and he shows me this here diagram

clearly I am missing the three hole bracket in VIEW B, I thought nothing of the holes in the water pump as I thought they were for the A.I.R pump bracket (which I have already deleted, and yes perhaps I should have paid a bit more attention where it went, LOL) but now I believe they is for the missing alternator bracket