´68 BB vs SB K-Member difference?

SSing said

So I took a look in my DC Racing Manuals, and sure enough. Three different BB K-members for A-body.
´67 K-member PN 2881925, ´68 PN 2883984 and ´68 w/p.s. PN 2883999 ´69 PN 2883999
The DC piece P4007935 has spool mount, so not really an adequat comparation here.

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I disagree on whether it is important to the discussion. I've run power steering on home built DC k-members without any interference problems. To the question of whether you are building an accurate duplicate of the factory big block A-body big block k-member you probably need to move the bracket. Power steering was not available on the '67 big block cars.