There is a decent amount of info on it at PN. I souped some for a friend a while ago. Shot with an 89B. IR effect is not nearly as strong as SFX or Konica 750 - not just in terms of sensitivity, but the response falls pretty quickly.
If you're shooting 35mm, why not use HIE? The effect is so much more dramatic, to me, it's not worth bothering with other stock. In 120, your choices are limited so it's a different story.
allan