Timing belts generally get replaced each 100,000ks. Engines oils every 500ks.
You can find R33 parts everywhere. Jap wreckers will have tons of stuff. There isn't a whole lot that goes wrong with them... generally.
About $180ea. Roughly (quoted, 255 Fed SS595s)
Depends how the 180 is driven. R33 will manage 500k per tank on highway I think
Alot. Watch the wet roads, gtsts looovvvvve to slip n slide.
No... they're not as bullet proof as the 2JZ, or the RB26 (RB ain't as good as 2JZ either). But, the RB25DET is strong. They come stock at about 145rwkw, and it's very very common for them to handle ~250rwkw on stock internals.