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I guess it comes down to how you define "real steam" to me Yates' low 5's is pretty damn good. I'd be thrilled if my car ever went that quick and I don't care what the lifter angle is lol.
I have one style and we're considering building a 59* version for little bro but really need W9RP rocker arms to make it happen



X block and 59 degree W-9's are capable for sure.......but hardly representative of the garden variety 59 degree stuff that is readily available.
Not quite unobtanium , but definitely unique.
Real steam starts around 600 h.p. for a small block in my opinion.
And it can be easily done with a stock block and 59 degree pushrod angles.
But there are better options out there.
Why not take advantage of them ?