Slant vs v8 z bar

Josh owen said

Does anyone have pics of the 2 side by side? Do i have to shorten or lengthen the slant 6 z bar to work?

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Please elaborate.
Is this an early A, or '67 and later A?
Small block or big block?
9 1/2, 10 1/2 or 11" bellhousing?
They're all different.