Put the call back in - that Jazzland side was recorded in 1960, not 1958. http://www.jazzdisco.org/rv1960-dis/c/#495
The only Wilen I can find from '58 that fits is a session for a soundtrack that's got Bags on PIANO(!!!!), Percy Heath, & Klook. Howeveer, a percussionist is listed in the discogrphy, and I don't hear one on here. Otherwise, it fits my initial impression perfectly (ok, SORTA perfectly ), except that I don't know Wilen's work hardly at all, he's NOT Frank Foster, and who knew that Bags was such a badass pianist? (yeah, I know, SOME of you did ). but other than Wilen's totally authentic bebop phraseology which he didn't learn on 52nd St, it fits the bill of "cats who were there". Assuming that it IS Wilen.
And if it's not, hand me a bottle of SOMETHING. I give up!