In stock form the VQ should be able to put up with the abuse of high revs. Get some supporting cooling mods, change your fluids more then often (you know, like don't get two hard drift sessions on the same oil change, or change your oil right after a drift day).

Generally speaking the ring lands go pretty easy. But on the stock 230-ish whp the block and rods don't suffer many failures.

You need to concentrate more on things like what TollBooth was talking about. The mounts, bushings (duh, suspension), and rearend and tranny are things you need to be beefing up.

 

I don't personally drift, but have some friends who think that's the best way to get around town...

I know there are several methods of drifting, and using different combinations to initiate a slide. If you are popping your clutch every time, or riding it a lot (obviously) it's not going to last long. With the right setup you should be able to start sliding by turning in/out and powering through. But just like daily driving it depends on how competent you are with driving a manual (...I mean... you do have a manual, right?) The clutch is meant to wear out, and under these conditions the life is going to be cut probably in half... start saving now... just in case.

You probably lucked out, earlier model 6MT's had grinding/syncro issues. If you aren't ramming each gear with your entire body weight behind it the syncros and gears should be good for some time...

But every car is unique. My engine and clutch may last 100,000 miles with continuous beating only needing to follow the Infiniti scheduled services. You may take care of your car religiously and be very meticulous about maintenance and blow your clutch or engine after 30,000 miles. It happens with forced induction guys all the time.