PRH said

The rockers are offset. They’re for a BB.
SB rockers are straight(all 16 the same, no lefts/rights).

The SB Crane rockers don’t really look anything like that.
They’re more like 273 rockers, but “beefier”.

Edit, I see Rocket has a pic of one above.

The OP may have still done okay with those depending on what he paid for them.
I believe the current price for Crane iron BB rockers and separator springs(no shafts) is about $500.

Crane SB rocker:

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Locomotion said

There is/was a company called Rocker Arm Specialists, or something like that, that took rockers and upgraded them with bushings, smaller shafts to not weaken the rockers and corrected ratio. The best adjusters are the ones with the allen-head tops as opposed to slots.

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Rocket said

Those look like big block rockers by looking at the pushrod adjuster location which seem to be a little off center. Small block adjusters are centered in the rocker.

The small block Crane iron rocker kits did come with springs and not spacers. The shafts were not grooved in the Crane small block kit. I have a couple of pictures of Crane small block rockers. I am posting one or two on my phone but may have more at home. Ignore the shafts in The background as they are not Crane shafts.

Crane in third picture is one on the left.

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