From what i heard the other day, the power fc will run with the auto but you have to manually shift the auto once it is done. A place called M V Auto's do it, and its around the $300 mark i think. It's just a lil black box that takes control of the gearbox and lets the power fc do it's own thing with everything else. He does awesome work, and even HPI or Zoom are using him at the moment with their rb26 4 door skyline they are doing. He has no website, but here is his address and number : Unit 3/1 Stirling Road, Blackwood, SA, 5051. Phone:. (08) 8370 0430. For a full rebuild in most auto cars, it is around $2600 but that is a full rebuild, carbon clutches, more cluches per gear, upgraded stally, stage 1 or 1.5 shift kit, service lockup clutch etc. That for the 1jz auto will hold 330+kw so i'd ring him and ask about the skyline ones, but i can't see there'd be too much difference
Hope that helps