There was one on Ebay just yesterday... I can't remember where I saw it but they are also making complete FJ40 conversion kits... I would love to know more about their design.
I might have a spare SpaceGhost one for sale too... the one we used worked flawlessly, but I am going to do a 3FE head swap on mine rather than the TBI... I will check and see if I can find it. (it may have found its way onto on of my helpers trucks)