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This bracket is 1966-67 with A/C and yes it fits both SBO and BBO. The bracket only bolts to the head and intake, so there is no impact from the different deck height (other than the fact that the wider, taller BBO requires a longer belt).
This is not an Olds bracket. Yes that looks like a late 1960s reservoir. The stud on the back of the reservoir would need to be moved to use this pump with an Olds bracket.
This bracket fits 1968-up, but it is missing the link that goes from the bolt hole on the left to the first exhaust manifold bolt. That looks like a 1970s reservoir. Note that the stud is at the bottom of the reservoir, unlike the pump directly above.