Yeah they don't make kendas big enough for you. I run the biggest they make, and they're 265s.
Just try out the Nankangs if they're that cheap. They're pretty bad though.
Don't really grip, make brownish smoke, and delaminate pretty easy. Dan has run them on his rx7 a few times, and it's never good haha. I've been running Kendas, and they seem like the best in that price range.
If you have single piston calipers, make sure the sliders on the calipers are lubed up good and slide freely. Make sure the cables aren't rubbing on anything, and everything is working properly.
Try getting some crappy stock pads. Drifting doesn't get brakes hot, so you want something with good cold bite. Project Mu pads are supposed to be awesome, but I've never tried em.
Hydraulic hand brakes really only work good with 2 piston calipers. So if you have z32 rears you should be good...
I wanna see a vid of that dude "testing" the rest of the interior in that car. Like trying to rip the shifter off, bending the handbrake, punching the dash, kicking out the windows, etc.