screw the rb26, to old, been done.
try something original
http://www.ebay.com.au/itm/FG-FALCON-FPV-XR6-TURBO-FULL-ENGINE-CONVERSION-KIT-/280780545579?pt=AU_Car_Parts_Accessories&hash=item415fd31e2b#ht_814wt_1110
from what I can gather you really seem to be more interested in the look and the plumbing than any real performance gain. have you considered just relocating the throttle body
done right it can work pretty well and look good too.