AE86 struts will go in using RA40 steering arms, as for strut top I have heard of people redrilling the strut tower to suit the AE71/TE72/AE86 bolt pattern. Whether this is legal or not, I don't know.
Personally I would go MX62 / MX73 Cressida Struts with KE55 strut tops, with an 83 Camry (monroe GT gas) shock and custom Aurora springs approx. 2 - 2.5 inches lower and a spring rate of 5 -5.5kgs.
As for diff I would ditch the piny diff and get a KE55 BW with swaybar support, Contact Boss Automotive in SA, they can do a billet minispool centre for about $350, and some billet axles for $1000 each.
As for swaybars you could upgrade the front bushes to nolathane or similar and add a thicker whiteline bolt that is available for KE55 BW with swaybar support.
Dale J.