Drive Belts Timing Belt Clutch Kit Intercooler Piping Equipment Hire (you may have friends with everythin ya need) Custom Tailshaft? (Dunno if it's needed, I guess it depends what tranny you use and if the R154 bolts up and the original shaft is a perfect fit) Disc Machining (Provided you use ones from frontcut and they are rusty, and you aren't just gunna use a pair of pads ) Brake Pads for said Upgraded Calipers Brake Fluid Other oils, fluids, filters
New Diff when you're having too much fun with the 6banga (as somebody calls it )
I may be wrong, and I'm sure people who have done this will be able to give you a better picture but it is most likely going to be a unanimous more expensive than I budgeted for.
GOOD LUCK, I hope to do the same or 2JZ/1UZ conversion someday!